identity: more cleaning and fixes after a code review

13 files changed, 0 insertions, 2372 deletions

diff --git a/vendor/github.com/google/go-cmp/LICENSE b/vendor/github.com/google/go-cmp/LICENSE
deleted file mode 100644
index 32017f8f..00000000
--- a/vendor/github.com/google/go-cmp/LICENSE
+++ /dev/null
@@ -1,27 +0,0 @@
-Copyright (c) 2017 The Go Authors. All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are
-met:
-
-   * Redistributions of source code must retain the above copyright
-notice, this list of conditions and the following disclaimer.
-   * Redistributions in binary form must reproduce the above
-copyright notice, this list of conditions and the following disclaimer
-in the documentation and/or other materials provided with the
-distribution.
-   * Neither the name of Google Inc. nor the names of its
-contributors may be used to endorse or promote products derived from
-this software without specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/vendor/github.com/google/go-cmp/cmp/compare.go b/vendor/github.com/google/go-cmp/cmp/compare.go
deleted file mode 100644
index 7e215f22..00000000
--- a/vendor/github.com/google/go-cmp/cmp/compare.go
+++ /dev/null
@@ -1,553 +0,0 @@
-// Copyright 2017, The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE.md file.
-
-// Package cmp determines equality of values.
-//
-// This package is intended to be a more powerful and safer alternative to
-// reflect.DeepEqual for comparing whether two values are semantically equal.
-//
-// The primary features of cmp are:
-//
-// • When the default behavior of equality does not suit the needs of the test,
-// custom equality functions can override the equality operation.
-// For example, an equality function may report floats as equal so long as they
-// are within some tolerance of each other.
-//
-// • Types that have an Equal method may use that method to determine equality.
-// This allows package authors to determine the equality operation for the types
-// that they define.
-//
-// • If no custom equality functions are used and no Equal method is defined,
-// equality is determined by recursively comparing the primitive kinds on both
-// values, much like reflect.DeepEqual. Unlike reflect.DeepEqual, unexported
-// fields are not compared by default; they result in panics unless suppressed
-// by using an Ignore option (see cmpopts.IgnoreUnexported) or explicitly compared
-// using the AllowUnexported option.
-package cmp
-
-import (
-	"fmt"
-	"reflect"
-
-	"github.com/google/go-cmp/cmp/internal/diff"
-	"github.com/google/go-cmp/cmp/internal/function"
-	"github.com/google/go-cmp/cmp/internal/value"
-)
-
-// BUG(dsnet): Maps with keys containing NaN values cannot be properly compared due to
-// the reflection package's inability to retrieve such entries. Equal will panic
-// anytime it comes across a NaN key, but this behavior may change.
-//
-// See https://golang.org/issue/11104 for more details.
-
-var nothing = reflect.Value{}
-
-// Equal reports whether x and y are equal by recursively applying the
-// following rules in the given order to x and y and all of their sub-values:
-//
-// • If two values are not of the same type, then they are never equal
-// and the overall result is false.
-//
-// • Let S be the set of all Ignore, Transformer, and Comparer options that
-// remain after applying all path filters, value filters, and type filters.
-// If at least one Ignore exists in S, then the comparison is ignored.
-// If the number of Transformer and Comparer options in S is greater than one,
-// then Equal panics because it is ambiguous which option to use.
-// If S contains a single Transformer, then use that to transform the current
-// values and recursively call Equal on the output values.
-// If S contains a single Comparer, then use that to compare the current values.
-// Otherwise, evaluation proceeds to the next rule.
-//
-// • If the values have an Equal method of the form "(T) Equal(T) bool" or
-// "(T) Equal(I) bool" where T is assignable to I, then use the result of
-// x.Equal(y) even if x or y is nil.
-// Otherwise, no such method exists and evaluation proceeds to the next rule.
-//
-// • Lastly, try to compare x and y based on their basic kinds.
-// Simple kinds like booleans, integers, floats, complex numbers, strings, and
-// channels are compared using the equivalent of the == operator in Go.
-// Functions are only equal if they are both nil, otherwise they are unequal.
-// Pointers are equal if the underlying values they point to are also equal.
-// Interfaces are equal if their underlying concrete values are also equal.
-//
-// Structs are equal if all of their fields are equal. If a struct contains
-// unexported fields, Equal panics unless the AllowUnexported option is used or
-// an Ignore option (e.g., cmpopts.IgnoreUnexported) ignores that field.
-//
-// Arrays, slices, and maps are equal if they are both nil or both non-nil
-// with the same length and the elements at each index or key are equal.
-// Note that a non-nil empty slice and a nil slice are not equal.
-// To equate empty slices and maps, consider using cmpopts.EquateEmpty.
-// Map keys are equal according to the == operator.
-// To use custom comparisons for map keys, consider using cmpopts.SortMaps.
-func Equal(x, y interface{}, opts ...Option) bool {
-	s := newState(opts)
-	s.compareAny(reflect.ValueOf(x), reflect.ValueOf(y))
-	return s.result.Equal()
-}
-
-// Diff returns a human-readable report of the differences between two values.
-// It returns an empty string if and only if Equal returns true for the same
-// input values and options. The output string will use the "-" symbol to
-// indicate elements removed from x, and the "+" symbol to indicate elements
-// added to y.
-//
-// Do not depend on this output being stable.
-func Diff(x, y interface{}, opts ...Option) string {
-	r := new(defaultReporter)
-	opts = Options{Options(opts), r}
-	eq := Equal(x, y, opts...)
-	d := r.String()
-	if (d == "") != eq {
-		panic("inconsistent difference and equality results")
-	}
-	return d
-}
-
-type state struct {
-	// These fields represent the "comparison state".
-	// Calling statelessCompare must not result in observable changes to these.
-	result   diff.Result // The current result of comparison
-	curPath  Path        // The current path in the value tree
-	reporter reporter    // Optional reporter used for difference formatting
-
-	// dynChecker triggers pseudo-random checks for option correctness.
-	// It is safe for statelessCompare to mutate this value.
-	dynChecker dynChecker
-
-	// These fields, once set by processOption, will not change.
-	exporters map[reflect.Type]bool // Set of structs with unexported field visibility
-	opts      Options               // List of all fundamental and filter options
-}
-
-func newState(opts []Option) *state {
-	s := new(state)
-	for _, opt := range opts {
-		s.processOption(opt)
-	}
-	return s
-}
-
-func (s *state) processOption(opt Option) {
-	switch opt := opt.(type) {
-	case nil:
-	case Options:
-		for _, o := range opt {
-			s.processOption(o)
-		}
-	case coreOption:
-		type filtered interface {
-			isFiltered() bool
-		}
-		if fopt, ok := opt.(filtered); ok && !fopt.isFiltered() {
-			panic(fmt.Sprintf("cannot use an unfiltered option: %v", opt))
-		}
-		s.opts = append(s.opts, opt)
-	case visibleStructs:
-		if s.exporters == nil {
-			s.exporters = make(map[reflect.Type]bool)
-		}
-		for t := range opt {
-			s.exporters[t] = true
-		}
-	case reporter:
-		if s.reporter != nil {
-			panic("difference reporter already registered")
-		}
-		s.reporter = opt
-	default:
-		panic(fmt.Sprintf("unknown option %T", opt))
-	}
-}
-
-// statelessCompare compares two values and returns the result.
-// This function is stateless in that it does not alter the current result,
-// or output to any registered reporters.
-func (s *state) statelessCompare(vx, vy reflect.Value) diff.Result {
-	// We do not save and restore the curPath because all of the compareX
-	// methods should properly push and pop from the path.
-	// It is an implementation bug if the contents of curPath differs from
-	// when calling this function to when returning from it.
-
-	oldResult, oldReporter := s.result, s.reporter
-	s.result = diff.Result{} // Reset result
-	s.reporter = nil         // Remove reporter to avoid spurious printouts
-	s.compareAny(vx, vy)
-	res := s.result
-	s.result, s.reporter = oldResult, oldReporter
-	return res
-}
-
-func (s *state) compareAny(vx, vy reflect.Value) {
-	// TODO: Support cyclic data structures.
-
-	// Rule 0: Differing types are never equal.
-	if !vx.IsValid() || !vy.IsValid() {
-		s.report(vx.IsValid() == vy.IsValid(), vx, vy)
-		return
-	}
-	if vx.Type() != vy.Type() {
-		s.report(false, vx, vy) // Possible for path to be empty
-		return
-	}
-	t := vx.Type()
-	if len(s.curPath) == 0 {
-		s.curPath.push(&pathStep{typ: t})
-		defer s.curPath.pop()
-	}
-	vx, vy = s.tryExporting(vx, vy)
-
-	// Rule 1: Check whether an option applies on this node in the value tree.
-	if s.tryOptions(vx, vy, t) {
-		return
-	}
-
-	// Rule 2: Check whether the type has a valid Equal method.
-	if s.tryMethod(vx, vy, t) {
-		return
-	}
-
-	// Rule 3: Recursively descend into each value's underlying kind.
-	switch t.Kind() {
-	case reflect.Bool:
-		s.report(vx.Bool() == vy.Bool(), vx, vy)
-		return
-	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
-		s.report(vx.Int() == vy.Int(), vx, vy)
-		return
-	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
-		s.report(vx.Uint() == vy.Uint(), vx, vy)
-		return
-	case reflect.Float32, reflect.Float64:
-		s.report(vx.Float() == vy.Float(), vx, vy)
-		return
-	case reflect.Complex64, reflect.Complex128:
-		s.report(vx.Complex() == vy.Complex(), vx, vy)
-		return
-	case reflect.String:
-		s.report(vx.String() == vy.String(), vx, vy)
-		return
-	case reflect.Chan, reflect.UnsafePointer:
-		s.report(vx.Pointer() == vy.Pointer(), vx, vy)
-		return
-	case reflect.Func:
-		s.report(vx.IsNil() && vy.IsNil(), vx, vy)
-		return
-	case reflect.Ptr:
-		if vx.IsNil() || vy.IsNil() {
-			s.report(vx.IsNil() && vy.IsNil(), vx, vy)
-			return
-		}
-		s.curPath.push(&indirect{pathStep{t.Elem()}})
-		defer s.curPath.pop()
-		s.compareAny(vx.Elem(), vy.Elem())
-		return
-	case reflect.Interface:
-		if vx.IsNil() || vy.IsNil() {
-			s.report(vx.IsNil() && vy.IsNil(), vx, vy)
-			return
-		}
-		if vx.Elem().Type() != vy.Elem().Type() {
-			s.report(false, vx.Elem(), vy.Elem())
-			return
-		}
-		s.curPath.push(&typeAssertion{pathStep{vx.Elem().Type()}})
-		defer s.curPath.pop()
-		s.compareAny(vx.Elem(), vy.Elem())
-		return
-	case reflect.Slice:
-		if vx.IsNil() || vy.IsNil() {
-			s.report(vx.IsNil() && vy.IsNil(), vx, vy)
-			return
-		}
-		fallthrough
-	case reflect.Array:
-		s.compareArray(vx, vy, t)
-		return
-	case reflect.Map:
-		s.compareMap(vx, vy, t)
-		return
-	case reflect.Struct:
-		s.compareStruct(vx, vy, t)
-		return
-	default:
-		panic(fmt.Sprintf("%v kind not handled", t.Kind()))
-	}
-}
-
-func (s *state) tryExporting(vx, vy reflect.Value) (reflect.Value, reflect.Value) {
-	if sf, ok := s.curPath[len(s.curPath)-1].(*structField); ok && sf.unexported {
-		if sf.force {
-			// Use unsafe pointer arithmetic to get read-write access to an
-			// unexported field in the struct.
-			vx = unsafeRetrieveField(sf.pvx, sf.field)
-			vy = unsafeRetrieveField(sf.pvy, sf.field)
-		} else {
-			// We are not allowed to export the value, so invalidate them
-			// so that tryOptions can panic later if not explicitly ignored.
-			vx = nothing
-			vy = nothing
-		}
-	}
-	return vx, vy
-}
-
-func (s *state) tryOptions(vx, vy reflect.Value, t reflect.Type) bool {
-	// If there were no FilterValues, we will not detect invalid inputs,
-	// so manually check for them and append invalid if necessary.
-	// We still evaluate the options since an ignore can override invalid.
-	opts := s.opts
-	if !vx.IsValid() || !vy.IsValid() {
-		opts = Options{opts, invalid{}}
-	}
-
-	// Evaluate all filters and apply the remaining options.
-	if opt := opts.filter(s, vx, vy, t); opt != nil {
-		opt.apply(s, vx, vy)
-		return true
-	}
-	return false
-}
-
-func (s *state) tryMethod(vx, vy reflect.Value, t reflect.Type) bool {
-	// Check if this type even has an Equal method.
-	m, ok := t.MethodByName("Equal")
-	if !ok || !function.IsType(m.Type, function.EqualAssignable) {
-		return false
-	}
-
-	eq := s.callTTBFunc(m.Func, vx, vy)
-	s.report(eq, vx, vy)
-	return true
-}
-
-func (s *state) callTRFunc(f, v reflect.Value) reflect.Value {
-	v = sanitizeValue(v, f.Type().In(0))
-	if !s.dynChecker.Next() {
-		return f.Call([]reflect.Value{v})[0]
-	}
-
-	// Run the function twice and ensure that we get the same results back.
-	// We run in goroutines so that the race detector (if enabled) can detect
-	// unsafe mutations to the input.
-	c := make(chan reflect.Value)
-	go detectRaces(c, f, v)
-	want := f.Call([]reflect.Value{v})[0]
-	if got := <-c; !s.statelessCompare(got, want).Equal() {
-		// To avoid false-positives with non-reflexive equality operations,
-		// we sanity check whether a value is equal to itself.
-		if !s.statelessCompare(want, want).Equal() {
-			return want
-		}
-		fn := getFuncName(f.Pointer())
-		panic(fmt.Sprintf("non-deterministic function detected: %s", fn))
-	}
-	return want
-}
-
-func (s *state) callTTBFunc(f, x, y reflect.Value) bool {
-	x = sanitizeValue(x, f.Type().In(0))
-	y = sanitizeValue(y, f.Type().In(1))
-	if !s.dynChecker.Next() {
-		return f.Call([]reflect.Value{x, y})[0].Bool()
-	}
-
-	// Swapping the input arguments is sufficient to check that
-	// f is symmetric and deterministic.
-	// We run in goroutines so that the race detector (if enabled) can detect
-	// unsafe mutations to the input.
-	c := make(chan reflect.Value)
-	go detectRaces(c, f, y, x)
-	want := f.Call([]reflect.Value{x, y})[0].Bool()
-	if got := <-c; !got.IsValid() || got.Bool() != want {
-		fn := getFuncName(f.Pointer())
-		panic(fmt.Sprintf("non-deterministic or non-symmetric function detected: %s", fn))
-	}
-	return want
-}
-
-func detectRaces(c chan<- reflect.Value, f reflect.Value, vs ...reflect.Value) {
-	var ret reflect.Value
-	defer func() {
-		recover() // Ignore panics, let the other call to f panic instead
-		c <- ret
-	}()
-	ret = f.Call(vs)[0]
-}
-
-// sanitizeValue converts nil interfaces of type T to those of type R,
-// assuming that T is assignable to R.
-// Otherwise, it returns the input value as is.
-func sanitizeValue(v reflect.Value, t reflect.Type) reflect.Value {
-	// TODO(dsnet): Remove this hacky workaround.
-	// See https://golang.org/issue/22143
-	if v.Kind() == reflect.Interface && v.IsNil() && v.Type() != t {
-		return reflect.New(t).Elem()
-	}
-	return v
-}
-
-func (s *state) compareArray(vx, vy reflect.Value, t reflect.Type) {
-	step := &sliceIndex{pathStep{t.Elem()}, 0, 0}
-	s.curPath.push(step)
-
-	// Compute an edit-script for slices vx and vy.
-	es := diff.Difference(vx.Len(), vy.Len(), func(ix, iy int) diff.Result {
-		step.xkey, step.ykey = ix, iy
-		return s.statelessCompare(vx.Index(ix), vy.Index(iy))
-	})
-
-	// Report the entire slice as is if the arrays are of primitive kind,
-	// and the arrays are different enough.
-	isPrimitive := false
-	switch t.Elem().Kind() {
-	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64,
-		reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr,
-		reflect.Bool, reflect.Float32, reflect.Float64, reflect.Complex64, reflect.Complex128:
-		isPrimitive = true
-	}
-	if isPrimitive && es.Dist() > (vx.Len()+vy.Len())/4 {
-		s.curPath.pop() // Pop first since we are reporting the whole slice
-		s.report(false, vx, vy)
-		return
-	}
-
-	// Replay the edit-script.
-	var ix, iy int
-	for _, e := range es {
-		switch e {
-		case diff.UniqueX:
-			step.xkey, step.ykey = ix, -1
-			s.report(false, vx.Index(ix), nothing)
-			ix++
-		case diff.UniqueY:
-			step.xkey, step.ykey = -1, iy
-			s.report(false, nothing, vy.Index(iy))
-			iy++
-		default:
-			step.xkey, step.ykey = ix, iy
-			if e == diff.Identity {
-				s.report(true, vx.Index(ix), vy.Index(iy))
-			} else {
-				s.compareAny(vx.Index(ix), vy.Index(iy))
-			}
-			ix++
-			iy++
-		}
-	}
-	s.curPath.pop()
-	return
-}
-
-func (s *state) compareMap(vx, vy reflect.Value, t reflect.Type) {
-	if vx.IsNil() || vy.IsNil() {
-		s.report(vx.IsNil() && vy.IsNil(), vx, vy)
-		return
-	}
-
-	// We combine and sort the two map keys so that we can perform the
-	// comparisons in a deterministic order.
-	step := &mapIndex{pathStep: pathStep{t.Elem()}}
-	s.curPath.push(step)
-	defer s.curPath.pop()
-	for _, k := range value.SortKeys(append(vx.MapKeys(), vy.MapKeys()...)) {
-		step.key = k
-		vvx := vx.MapIndex(k)
-		vvy := vy.MapIndex(k)
-		switch {
-		case vvx.IsValid() && vvy.IsValid():
-			s.compareAny(vvx, vvy)
-		case vvx.IsValid() && !vvy.IsValid():
-			s.report(false, vvx, nothing)
-		case !vvx.IsValid() && vvy.IsValid():
-			s.report(false, nothing, vvy)
-		default:
-			// It is possible for both vvx and vvy to be invalid if the
-			// key contained a NaN value in it. There is no way in
-			// reflection to be able to retrieve these values.
-			// See https://golang.org/issue/11104
-			panic(fmt.Sprintf("%#v has map key with NaNs", s.curPath))
-		}
-	}
-}
-
-func (s *state) compareStruct(vx, vy reflect.Value, t reflect.Type) {
-	var vax, vay reflect.Value // Addressable versions of vx and vy
-
-	step := &structField{}
-	s.curPath.push(step)
-	defer s.curPath.pop()
-	for i := 0; i < t.NumField(); i++ {
-		vvx := vx.Field(i)
-		vvy := vy.Field(i)
-		step.typ = t.Field(i).Type
-		step.name = t.Field(i).Name
-		step.idx = i
-		step.unexported = !isExported(step.name)
-		if step.unexported {
-			// Defer checking of unexported fields until later to give an
-			// Ignore a chance to ignore the field.
-			if !vax.IsValid() || !vay.IsValid() {
-				// For unsafeRetrieveField to work, the parent struct must
-				// be addressable. Create a new copy of the values if
-				// necessary to make them addressable.
-				vax = makeAddressable(vx)
-				vay = makeAddressable(vy)
-			}
-			step.force = s.exporters[t]
-			step.pvx = vax
-			step.pvy = vay
-			step.field = t.Field(i)
-		}
-		s.compareAny(vvx, vvy)
-	}
-}
-
-// report records the result of a single comparison.
-// It also calls Report if any reporter is registered.
-func (s *state) report(eq bool, vx, vy reflect.Value) {
-	if eq {
-		s.result.NSame++
-	} else {
-		s.result.NDiff++
-	}
-	if s.reporter != nil {
-		s.reporter.Report(vx, vy, eq, s.curPath)
-	}
-}
-
-// dynChecker tracks the state needed to periodically perform checks that
-// user provided functions are symmetric and deterministic.
-// The zero value is safe for immediate use.
-type dynChecker struct{ curr, next int }
-
-// Next increments the state and reports whether a check should be performed.
-//
-// Checks occur every Nth function call, where N is a triangular number:
-//	0 1 3 6 10 15 21 28 36 45 55 66 78 91 105 120 136 153 171 190 ...
-// See https://en.wikipedia.org/wiki/Triangular_number
-//
-// This sequence ensures that the cost of checks drops significantly as
-// the number of functions calls grows larger.
-func (dc *dynChecker) Next() bool {
-	ok := dc.curr == dc.next
-	if ok {
-		dc.curr = 0
-		dc.next++
-	}
-	dc.curr++
-	return ok
-}
-
-// makeAddressable returns a value that is always addressable.
-// It returns the input verbatim if it is already addressable,
-// otherwise it creates a new value and returns an addressable copy.
-func makeAddressable(v reflect.Value) reflect.Value {
-	if v.CanAddr() {
-		return v
-	}
-	vc := reflect.New(v.Type()).Elem()
-	vc.Set(v)
-	return vc
-}
diff --git a/vendor/github.com/google/go-cmp/cmp/internal/diff/debug_disable.go b/vendor/github.com/google/go-cmp/cmp/internal/diff/debug_disable.go
deleted file mode 100644
index 42afa496..00000000
--- a/vendor/github.com/google/go-cmp/cmp/internal/diff/debug_disable.go
+++ /dev/null
@@ -1,17 +0,0 @@
-// Copyright 2017, The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE.md file.
-
-// +build !debug
-
-package diff
-
-var debug debugger
-
-type debugger struct{}
-
-func (debugger) Begin(_, _ int, f EqualFunc, _, _ *EditScript) EqualFunc {
-	return f
-}
-func (debugger) Update() {}
-func (debugger) Finish() {}
diff --git a/vendor/github.com/google/go-cmp/cmp/internal/diff/debug_enable.go b/vendor/github.com/google/go-cmp/cmp/internal/diff/debug_enable.go
deleted file mode 100644
index fd9f7f17..00000000
--- a/vendor/github.com/google/go-cmp/cmp/internal/diff/debug_enable.go
+++ /dev/null
@@ -1,122 +0,0 @@
-// Copyright 2017, The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE.md file.
-
-// +build debug
-
-package diff
-
-import (
-	"fmt"
-	"strings"
-	"sync"
-	"time"
-)
-
-// The algorithm can be seen running in real-time by enabling debugging:
-//	go test -tags=debug -v
-//
-// Example output:
-//	=== RUN   TestDifference/#34
-//	┌───────────────────────────────┐
-//	│ \ · · · · · · · · · · · · · · │
-//	│ · # · · · · · · · · · · · · · │
-//	│ · \ · · · · · · · · · · · · · │
-//	│ · · \ · · · · · · · · · · · · │
-//	│ · · · X # · · · · · · · · · · │
-//	│ · · · # \ · · · · · · · · · · │
-//	│ · · · · · # # · · · · · · · · │
-//	│ · · · · · # \ · · · · · · · · │
-//	│ · · · · · · · \ · · · · · · · │
-//	│ · · · · · · · · \ · · · · · · │
-//	│ · · · · · · · · · \ · · · · · │
-//	│ · · · · · · · · · · \ · · # · │
-//	│ · · · · · · · · · · · \ # # · │
-//	│ · · · · · · · · · · · # # # · │
-//	│ · · · · · · · · · · # # # # · │
-//	│ · · · · · · · · · # # # # # · │
-//	│ · · · · · · · · · · · · · · \ │
-//	└───────────────────────────────┘
-//	[.Y..M.XY......YXYXY.|]
-//
-// The grid represents the edit-graph where the horizontal axis represents
-// list X and the vertical axis represents list Y. The start of the two lists
-// is the top-left, while the ends are the bottom-right. The '·' represents
-// an unexplored node in the graph. The '\' indicates that the two symbols
-// from list X and Y are equal. The 'X' indicates that two symbols are similar
-// (but not exactly equal) to each other. The '#' indicates that the two symbols
-// are different (and not similar). The algorithm traverses this graph trying to
-// make the paths starting in the top-left and the bottom-right connect.
-//
-// The series of '.', 'X', 'Y', and 'M' characters at the bottom represents
-// the currently established path from the forward and reverse searches,
-// separated by a '|' character.
-
-const (
-	updateDelay  = 100 * time.Millisecond
-	finishDelay  = 500 * time.Millisecond
-	ansiTerminal = true // ANSI escape codes used to move terminal cursor
-)
-
-var debug debugger
-
-type debugger struct {
-	sync.Mutex
-	p1, p2           EditScript
-	fwdPath, revPath *EditScript
-	grid             []byte
-	lines            int
-}
-
-func (dbg *debugger) Begin(nx, ny int, f EqualFunc, p1, p2 *EditScript) EqualFunc {
-	dbg.Lock()
-	dbg.fwdPath, dbg.revPath = p1, p2
-	top := "┌─" + strings.Repeat("──", nx) + "┐\n"
-	row := "│ " + strings.Repeat("· ", nx) + "│\n"
-	btm := "└─" + strings.Repeat("──", nx) + "┘\n"
-	dbg.grid = []byte(top + strings.Repeat(row, ny) + btm)
-	dbg.lines = strings.Count(dbg.String(), "\n")
-	fmt.Print(dbg)
-
-	// Wrap the EqualFunc so that we can intercept each result.
-	return func(ix, iy int) (r Result) {
-		cell := dbg.grid[len(top)+iy*len(row):][len("│ ")+len("· ")*ix:][:len("·")]
-		for i := range cell {
-			cell[i] = 0 // Zero out the multiple bytes of UTF-8 middle-dot
-		}
-		switch r = f(ix, iy); {
-		case r.Equal():
-			cell[0] = '\\'
-		case r.Similar():
-			cell[0] = 'X'
-		default:
-			cell[0] = '#'
-		}
-		return
-	}
-}
-
-func (dbg *debugger) Update() {
-	dbg.print(updateDelay)
-}
-
-func (dbg *debugger) Finish() {
-	dbg.print(finishDelay)
-	dbg.Unlock()
-}
-
-func (dbg *debugger) String() string {
-	dbg.p1, dbg.p2 = *dbg.fwdPath, dbg.p2[:0]
-	for i := len(*dbg.revPath) - 1; i >= 0; i-- {
-		dbg.p2 = append(dbg.p2, (*dbg.revPath)[i])
-	}
-	return fmt.Sprintf("%s[%v|%v]\n\n", dbg.grid, dbg.p1, dbg.p2)
-}
-
-func (dbg *debugger) print(d time.Duration) {
-	if ansiTerminal {
-		fmt.Printf("\x1b[%dA", dbg.lines) // Reset terminal cursor
-	}
-	fmt.Print(dbg)
-	time.Sleep(d)
-}
diff --git a/vendor/github.com/google/go-cmp/cmp/internal/diff/diff.go b/vendor/github.com/google/go-cmp/cmp/internal/diff/diff.go
deleted file mode 100644
index 260befea..00000000
--- a/vendor/github.com/google/go-cmp/cmp/internal/diff/diff.go
+++ /dev/null
@@ -1,363 +0,0 @@
-// Copyright 2017, The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE.md file.
-
-// Package diff implements an algorithm for producing edit-scripts.
-// The edit-script is a sequence of operations needed to transform one list
-// of symbols into another (or vice-versa). The edits allowed are insertions,
-// deletions, and modifications. The summation of all edits is called the
-// Levenshtein distance as this problem is well-known in computer science.
-//
-// This package prioritizes performance over accuracy. That is, the run time
-// is more important than obtaining a minimal Levenshtein distance.
-package diff
-
-// EditType represents a single operation within an edit-script.
-type EditType uint8
-
-const (
-	// Identity indicates that a symbol pair is identical in both list X and Y.
-	Identity EditType = iota
-	// UniqueX indicates that a symbol only exists in X and not Y.
-	UniqueX
-	// UniqueY indicates that a symbol only exists in Y and not X.
-	UniqueY
-	// Modified indicates that a symbol pair is a modification of each other.
-	Modified
-)
-
-// EditScript represents the series of differences between two lists.
-type EditScript []EditType
-
-// String returns a human-readable string representing the edit-script where
-// Identity, UniqueX, UniqueY, and Modified are represented by the
-// '.', 'X', 'Y', and 'M' characters, respectively.
-func (es EditScript) String() string {
-	b := make([]byte, len(es))
-	for i, e := range es {
-		switch e {
-		case Identity:
-			b[i] = '.'
-		case UniqueX:
-			b[i] = 'X'
-		case UniqueY:
-			b[i] = 'Y'
-		case Modified:
-			b[i] = 'M'
-		default:
-			panic("invalid edit-type")
-		}
-	}
-	return string(b)
-}
-
-// stats returns a histogram of the number of each type of edit operation.
-func (es EditScript) stats() (s struct{ NI, NX, NY, NM int }) {
-	for _, e := range es {
-		switch e {
-		case Identity:
-			s.NI++
-		case UniqueX:
-			s.NX++
-		case UniqueY:
-			s.NY++
-		case Modified:
-			s.NM++
-		default:
-			panic("invalid edit-type")
-		}
-	}
-	return
-}
-
-// Dist is the Levenshtein distance and is guaranteed to be 0 if and only if
-// lists X and Y are equal.
-func (es EditScript) Dist() int { return len(es) - es.stats().NI }
-
-// LenX is the length of the X list.
-func (es EditScript) LenX() int { return len(es) - es.stats().NY }
-
-// LenY is the length of the Y list.
-func (es EditScript) LenY() int { return len(es) - es.stats().NX }
-
-// EqualFunc reports whether the symbols at indexes ix and iy are equal.
-// When called by Difference, the index is guaranteed to be within nx and ny.
-type EqualFunc func(ix int, iy int) Result
-
-// Result is the result of comparison.
-// NSame is the number of sub-elements that are equal.
-// NDiff is the number of sub-elements that are not equal.
-type Result struct{ NSame, NDiff int }
-
-// Equal indicates whether the symbols are equal. Two symbols are equal
-// if and only if NDiff == 0. If Equal, then they are also Similar.
-func (r Result) Equal() bool { return r.NDiff == 0 }
-
-// Similar indicates whether two symbols are similar and may be represented
-// by using the Modified type. As a special case, we consider binary comparisons
-// (i.e., those that return Result{1, 0} or Result{0, 1}) to be similar.
-//
-// The exact ratio of NSame to NDiff to determine similarity may change.
-func (r Result) Similar() bool {
-	// Use NSame+1 to offset NSame so that binary comparisons are similar.
-	return r.NSame+1 >= r.NDiff
-}
-
-// Difference reports whether two lists of lengths nx and ny are equal
-// given the definition of equality provided as f.
-//
-// This function returns an edit-script, which is a sequence of operations
-// needed to convert one list into the other. The following invariants for
-// the edit-script are maintained:
-//	• eq == (es.Dist()==0)
-//	• nx == es.LenX()
-//	• ny == es.LenY()
-//
-// This algorithm is not guaranteed to be an optimal solution (i.e., one that
-// produces an edit-script with a minimal Levenshtein distance). This algorithm
-// favors performance over optimality. The exact output is not guaranteed to
-// be stable and may change over time.
-func Difference(nx, ny int, f EqualFunc) (es EditScript) {
-	// This algorithm is based on traversing what is known as an "edit-graph".
-	// See Figure 1 from "An O(ND) Difference Algorithm and Its Variations"
-	// by Eugene W. Myers. Since D can be as large as N itself, this is
-	// effectively O(N^2). Unlike the algorithm from that paper, we are not
-	// interested in the optimal path, but at least some "decent" path.
-	//
-	// For example, let X and Y be lists of symbols:
-	//	X = [A B C A B B A]
-	//	Y = [C B A B A C]
-	//
-	// The edit-graph can be drawn as the following:
-	//	   A B C A B B A
-	//	  ┌─────────────┐
-	//	C │_|_|\|_|_|_|_│ 0
-	//	B │_|\|_|_|\|\|_│ 1
-	//	A │\|_|_|\|_|_|\│ 2
-	//	B │_|\|_|_|\|\|_│ 3
-	//	A │\|_|_|\|_|_|\│ 4
-	//	C │ | |\| | | | │ 5
-	//	  └─────────────┘ 6
-	//	   0 1 2 3 4 5 6 7
-	//
-	// List X is written along the horizontal axis, while list Y is written
-	// along the vertical axis. At any point on this grid, if the symbol in
-	// list X matches the corresponding symbol in list Y, then a '\' is drawn.
-	// The goal of any minimal edit-script algorithm is to find a path from the
-	// top-left corner to the bottom-right corner, while traveling through the
-	// fewest horizontal or vertical edges.
-	// A horizontal edge is equivalent to inserting a symbol from list X.
-	// A vertical edge is equivalent to inserting a symbol from list Y.
-	// A diagonal edge is equivalent to a matching symbol between both X and Y.
-
-	// Invariants:
-	//	• 0 ≤ fwdPath.X ≤ (fwdFrontier.X, revFrontier.X) ≤ revPath.X ≤ nx
-	//	• 0 ≤ fwdPath.Y ≤ (fwdFrontier.Y, revFrontier.Y) ≤ revPath.Y ≤ ny
-	//
-	// In general:
-	//	• fwdFrontier.X < revFrontier.X
-	//	• fwdFrontier.Y < revFrontier.Y
-	// Unless, it is time for the algorithm to terminate.
-	fwdPath := path{+1, point{0, 0}, make(EditScript, 0, (nx+ny)/2)}
-	revPath := path{-1, point{nx, ny}, make(EditScript, 0)}
-	fwdFrontier := fwdPath.point // Forward search frontier
-	revFrontier := revPath.point // Reverse search frontier
-
-	// Search budget bounds the cost of searching for better paths.
-	// The longest sequence of non-matching symbols that can be tolerated is
-	// approximately the square-root of the search budget.
-	searchBudget := 4 * (nx + ny) // O(n)
-
-	// The algorithm below is a greedy, meet-in-the-middle algorithm for
-	// computing sub-optimal edit-scripts between two lists.
-	//
-	// The algorithm is approximately as follows:
-	//	• Searching for differences switches back-and-forth between
-	//	a search that starts at the beginning (the top-left corner), and
-	//	a search that starts at the end (the bottom-right corner). The goal of
-	//	the search is connect with the search from the opposite corner.
-	//	• As we search, we build a path in a greedy manner, where the first
-	//	match seen is added to the path (this is sub-optimal, but provides a
-	//	decent result in practice). When matches are found, we try the next pair
-	//	of symbols in the lists and follow all matches as far as possible.
-	//	• When searching for matches, we search along a diagonal going through
-	//	through the "frontier" point. If no matches are found, we advance the
-	//	frontier towards the opposite corner.
-	//	• This algorithm terminates when either the X coordinates or the
-	//	Y coordinates of the forward and reverse frontier points ever intersect.
-	//
-	// This algorithm is correct even if searching only in the forward direction
-	// or in the reverse direction. We do both because it is commonly observed
-	// that two lists commonly differ because elements were added to the front
-	// or end of the other list.
-	//
-	// Running the tests with the "debug" build tag prints a visualization of
-	// the algorithm running in real-time. This is educational for understanding
-	// how the algorithm works. See debug_enable.go.
-	f = debug.Begin(nx, ny, f, &fwdPath.es, &revPath.es)
-	for {
-		// Forward search from the beginning.
-		if fwdFrontier.X >= revFrontier.X || fwdFrontier.Y >= revFrontier.Y || searchBudget == 0 {
-			break
-		}
-		for stop1, stop2, i := false, false, 0; !(stop1 && stop2) && searchBudget > 0; i++ {
-			// Search in a diagonal pattern for a match.
-			z := zigzag(i)
-			p := point{fwdFrontier.X + z, fwdFrontier.Y - z}
-			switch {
-			case p.X >= revPath.X || p.Y < fwdPath.Y:
-				stop1 = true // Hit top-right corner
-			case p.Y >= revPath.Y || p.X < fwdPath.X:
-				stop2 = true // Hit bottom-left corner
-			case f(p.X, p.Y).Equal():
-				// Match found, so connect the path to this point.
-				fwdPath.connect(p, f)
-				fwdPath.append(Identity)
-				// Follow sequence of matches as far as possible.
-				for fwdPath.X < revPath.X && fwdPath.Y < revPath.Y {
-					if !f(fwdPath.X, fwdPath.Y).Equal() {
-						break
-					}
-					fwdPath.append(Identity)
-				}
-				fwdFrontier = fwdPath.point
-				stop1, stop2 = true, true
-			default:
-				searchBudget-- // Match not found
-			}
-			debug.Update()
-		}
-		// Advance the frontier towards reverse point.
-		if revPath.X-fwdFrontier.X >= revPath.Y-fwdFrontier.Y {
-			fwdFrontier.X++
-		} else {
-			fwdFrontier.Y++
-		}
-
-		// Reverse search from the end.
-		if fwdFrontier.X >= revFrontier.X || fwdFrontier.Y >= revFrontier.Y || searchBudget == 0 {
-			break
-		}
-		for stop1, stop2, i := false, false, 0; !(stop1 && stop2) && searchBudget > 0; i++ {
-			// Search in a diagonal pattern for a match.
-			z := zigzag(i)
-			p := point{revFrontier.X - z, revFrontier.Y + z}
-			switch {
-			case fwdPath.X >= p.X || revPath.Y < p.Y:
-				stop1 = true // Hit bottom-left corner
-			case fwdPath.Y >= p.Y || revPath.X < p.X:
-				stop2 = true // Hit top-right corner
-			case f(p.X-1, p.Y-1).Equal():
-				// Match found, so connect the path to this point.
-				revPath.connect(p, f)
-				revPath.append(Identity)
-				// Follow sequence of matches as far as possible.
-				for fwdPath.X < revPath.X && fwdPath.Y < revPath.Y {
-					if !f(revPath.X-1, revPath.Y-1).Equal() {
-						break
-					}
-					revPath.append(Identity)
-				}
-				revFrontier = revPath.point
-				stop1, stop2 = true, true
-			default:
-				searchBudget-- // Match not found
-			}
-			debug.Update()
-		}
-		// Advance the frontier towards forward point.
-		if revFrontier.X-fwdPath.X >= revFrontier.Y-fwdPath.Y {
-			revFrontier.X--
-		} else {
-			revFrontier.Y--
-		}
-	}
-
-	// Join the forward and reverse paths and then append the reverse path.
-	fwdPath.connect(revPath.point, f)
-	for i := len(revPath.es) - 1; i >= 0; i-- {
-		t := revPath.es[i]
-		revPath.es = revPath.es[:i]
-		fwdPath.append(t)
-	}
-	debug.Finish()
-	return fwdPath.es
-}
-
-type path struct {
-	dir   int // +1 if forward, -1 if reverse
-	point     // Leading point of the EditScript path
-	es    EditScript
-}
-
-// connect appends any necessary Identity, Modified, UniqueX, or UniqueY types
-// to the edit-script to connect p.point to dst.
-func (p *path) connect(dst point, f EqualFunc) {
-	if p.dir > 0 {
-		// Connect in forward direction.
-		for dst.X > p.X && dst.Y > p.Y {
-			switch r := f(p.X, p.Y); {
-			case r.Equal():
-				p.append(Identity)
-			case r.Similar():
-				p.append(Modified)
-			case dst.X-p.X >= dst.Y-p.Y:
-				p.append(UniqueX)
-			default:
-				p.append(UniqueY)
-			}
-		}
-		for dst.X > p.X {
-			p.append(UniqueX)
-		}
-		for dst.Y > p.Y {
-			p.append(UniqueY)
-		}
-	} else {
-		// Connect in reverse direction.
-		for p.X > dst.X && p.Y > dst.Y {
-			switch r := f(p.X-1, p.Y-1); {
-			case r.Equal():
-				p.append(Identity)
-			case r.Similar():
-				p.append(Modified)
-			case p.Y-dst.Y >= p.X-dst.X:
-				p.append(UniqueY)
-			default:
-				p.append(UniqueX)
-			}
-		}
-		for p.X > dst.X {
-			p.append(UniqueX)
-		}
-		for p.Y > dst.Y {
-			p.append(UniqueY)
-		}
-	}
-}
-
-func (p *path) append(t EditType) {
-	p.es = append(p.es, t)
-	switch t {
-	case Identity, Modified:
-		p.add(p.dir, p.dir)
-	case UniqueX:
-		p.add(p.dir, 0)
-	case UniqueY:
-		p.add(0, p.dir)
-	}
-	debug.Update()
-}
-
-type point struct{ X, Y int }
-
-func (p *point) add(dx, dy int) { p.X += dx; p.Y += dy }
-
-// zigzag maps a consecutive sequence of integers to a zig-zag sequence.
-//	[0 1 2 3 4 5 ...] => [0 -1 +1 -2 +2 ...]
-func zigzag(x int) int {
-	if x&1 != 0 {
-		x = ^x
-	}
-	return x >> 1
-}
diff --git a/vendor/github.com/google/go-cmp/cmp/internal/function/func.go b/vendor/github.com/google/go-cmp/cmp/internal/function/func.go
deleted file mode 100644
index 4c35ff11..00000000
--- a/vendor/github.com/google/go-cmp/cmp/internal/function/func.go
+++ /dev/null
@@ -1,49 +0,0 @@
-// Copyright 2017, The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE.md file.
-
-// Package function identifies function types.
-package function
-
-import "reflect"
-
-type funcType int
-
-const (
-	_ funcType = iota
-
-	ttbFunc // func(T, T) bool
-	tibFunc // func(T, I) bool
-	trFunc  // func(T) R
-
-	Equal           = ttbFunc // func(T, T) bool
-	EqualAssignable = tibFunc // func(T, I) bool; encapsulates func(T, T) bool
-	Transformer     = trFunc  // func(T) R
-	ValueFilter     = ttbFunc // func(T, T) bool
-	Less            = ttbFunc // func(T, T) bool
-)
-
-var boolType = reflect.TypeOf(true)
-
-// IsType reports whether the reflect.Type is of the specified function type.
-func IsType(t reflect.Type, ft funcType) bool {
-	if t == nil || t.Kind() != reflect.Func || t.IsVariadic() {
-		return false
-	}
-	ni, no := t.NumIn(), t.NumOut()
-	switch ft {
-	case ttbFunc: // func(T, T) bool
-		if ni == 2 && no == 1 && t.In(0) == t.In(1) && t.Out(0) == boolType {
-			return true
-		}
-	case tibFunc: // func(T, I) bool
-		if ni == 2 && no == 1 && t.In(0).AssignableTo(t.In(1)) && t.Out(0) == boolType {
-			return true
-		}
-	case trFunc: // func(T) R
-		if ni == 1 && no == 1 {
-			return true
-		}
-	}
-	return false
-}
diff --git a/vendor/github.com/google/go-cmp/cmp/internal/value/format.go b/vendor/github.com/google/go-cmp/cmp/internal/value/format.go
deleted file mode 100644
index 657e5087..00000000
--- a/vendor/github.com/google/go-cmp/cmp/internal/value/format.go
+++ /dev/null
@@ -1,277 +0,0 @@
-// Copyright 2017, The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE.md file.
-
-// Package value provides functionality for reflect.Value types.
-package value
-
-import (
-	"fmt"
-	"reflect"
-	"strconv"
-	"strings"
-	"unicode"
-)
-
-var stringerIface = reflect.TypeOf((*fmt.Stringer)(nil)).Elem()
-
-// Format formats the value v as a string.
-//
-// This is similar to fmt.Sprintf("%+v", v) except this:
-//	* Prints the type unless it can be elided
-//	* Avoids printing struct fields that are zero
-//	* Prints a nil-slice as being nil, not empty
-//	* Prints map entries in deterministic order
-func Format(v reflect.Value, conf FormatConfig) string {
-	conf.printType = true
-	conf.followPointers = true
-	conf.realPointers = true
-	return formatAny(v, conf, nil)
-}
-
-type FormatConfig struct {
-	UseStringer        bool // Should the String method be used if available?
-	printType          bool // Should we print the type before the value?
-	PrintPrimitiveType bool // Should we print the type of primitives?
-	followPointers     bool // Should we recursively follow pointers?
-	realPointers       bool // Should we print the real address of pointers?
-}
-
-func formatAny(v reflect.Value, conf FormatConfig, visited map[uintptr]bool) string {
-	// TODO: Should this be a multi-line printout in certain situations?
-
-	if !v.IsValid() {
-		return "<non-existent>"
-	}
-	if conf.UseStringer && v.Type().Implements(stringerIface) && v.CanInterface() {
-		if (v.Kind() == reflect.Ptr || v.Kind() == reflect.Interface) && v.IsNil() {
-			return "<nil>"
-		}
-
-		const stringerPrefix = "s" // Indicates that the String method was used
-		s := v.Interface().(fmt.Stringer).String()
-		return stringerPrefix + formatString(s)
-	}
-
-	switch v.Kind() {
-	case reflect.Bool:
-		return formatPrimitive(v.Type(), v.Bool(), conf)
-	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
-		return formatPrimitive(v.Type(), v.Int(), conf)
-	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
-		if v.Type().PkgPath() == "" || v.Kind() == reflect.Uintptr {
-			// Unnamed uints are usually bytes or words, so use hexadecimal.
-			return formatPrimitive(v.Type(), formatHex(v.Uint()), conf)
-		}
-		return formatPrimitive(v.Type(), v.Uint(), conf)
-	case reflect.Float32, reflect.Float64:
-		return formatPrimitive(v.Type(), v.Float(), conf)
-	case reflect.Complex64, reflect.Complex128:
-		return formatPrimitive(v.Type(), v.Complex(), conf)
-	case reflect.String:
-		return formatPrimitive(v.Type(), formatString(v.String()), conf)
-	case reflect.UnsafePointer, reflect.Chan, reflect.Func:
-		return formatPointer(v, conf)
-	case reflect.Ptr:
-		if v.IsNil() {
-			if conf.printType {
-				return fmt.Sprintf("(%v)(nil)", v.Type())
-			}
-			return "<nil>"
-		}
-		if visited[v.Pointer()] || !conf.followPointers {
-			return formatPointer(v, conf)
-		}
-		visited = insertPointer(visited, v.Pointer())
-		return "&" + formatAny(v.Elem(), conf, visited)
-	case reflect.Interface:
-		if v.IsNil() {
-			if conf.printType {
-				return fmt.Sprintf("%v(nil)", v.Type())
-			}
-			return "<nil>"
-		}
-		return formatAny(v.Elem(), conf, visited)
-	case reflect.Slice:
-		if v.IsNil() {
-			if conf.printType {
-				return fmt.Sprintf("%v(nil)", v.Type())
-			}
-			return "<nil>"
-		}
-		if visited[v.Pointer()] {
-			return formatPointer(v, conf)
-		}
-		visited = insertPointer(visited, v.Pointer())
-		fallthrough
-	case reflect.Array:
-		var ss []string
-		subConf := conf
-		subConf.printType = v.Type().Elem().Kind() == reflect.Interface
-		for i := 0; i < v.Len(); i++ {
-			s := formatAny(v.Index(i), subConf, visited)
-			ss = append(ss, s)
-		}
-		s := fmt.Sprintf("{%s}", strings.Join(ss, ", "))
-		if conf.printType {
-			return v.Type().String() + s
-		}
-		return s
-	case reflect.Map:
-		if v.IsNil() {
-			if conf.printType {
-				return fmt.Sprintf("%v(nil)", v.Type())
-			}
-			return "<nil>"
-		}
-		if visited[v.Pointer()] {
-			return formatPointer(v, conf)
-		}
-		visited = insertPointer(visited, v.Pointer())
-
-		var ss []string
-		keyConf, valConf := conf, conf
-		keyConf.printType = v.Type().Key().Kind() == reflect.Interface
-		keyConf.followPointers = false
-		valConf.printType = v.Type().Elem().Kind() == reflect.Interface
-		for _, k := range SortKeys(v.MapKeys()) {
-			sk := formatAny(k, keyConf, visited)
-			sv := formatAny(v.MapIndex(k), valConf, visited)
-			ss = append(ss, fmt.Sprintf("%s: %s", sk, sv))
-		}
-		s := fmt.Sprintf("{%s}", strings.Join(ss, ", "))
-		if conf.printType {
-			return v.Type().String() + s
-		}
-		return s
-	case reflect.Struct:
-		var ss []string
-		subConf := conf
-		subConf.printType = true
-		for i := 0; i < v.NumField(); i++ {
-			vv := v.Field(i)
-			if isZero(vv) {
-				continue // Elide zero value fields
-			}
-			name := v.Type().Field(i).Name
-			subConf.UseStringer = conf.UseStringer
-			s := formatAny(vv, subConf, visited)
-			ss = append(ss, fmt.Sprintf("%s: %s", name, s))
-		}
-		s := fmt.Sprintf("{%s}", strings.Join(ss, ", "))
-		if conf.printType {
-			return v.Type().String() + s
-		}
-		return s
-	default:
-		panic(fmt.Sprintf("%v kind not handled", v.Kind()))
-	}
-}
-
-func formatString(s string) string {
-	// Use quoted string if it the same length as a raw string literal.
-	// Otherwise, attempt to use the raw string form.
-	qs := strconv.Quote(s)
-	if len(qs) == 1+len(s)+1 {
-		return qs
-	}
-
-	// Disallow newlines to ensure output is a single line.
-	// Only allow printable runes for readability purposes.
-	rawInvalid := func(r rune) bool {
-		return r == '`' || r == '\n' || !unicode.IsPrint(r)
-	}
-	if strings.IndexFunc(s, rawInvalid) < 0 {
-		return "`" + s + "`"
-	}
-	return qs
-}
-
-func formatPrimitive(t reflect.Type, v interface{}, conf FormatConfig) string {
-	if conf.printType && (conf.PrintPrimitiveType || t.PkgPath() != "") {
-		return fmt.Sprintf("%v(%v)", t, v)
-	}
-	return fmt.Sprintf("%v", v)
-}
-
-func formatPointer(v reflect.Value, conf FormatConfig) string {
-	p := v.Pointer()
-	if !conf.realPointers {
-		p = 0 // For deterministic printing purposes
-	}
-	s := formatHex(uint64(p))
-	if conf.printType {
-		return fmt.Sprintf("(%v)(%s)", v.Type(), s)
-	}
-	return s
-}
-
-func formatHex(u uint64) string {
-	var f string
-	switch {
-	case u <= 0xff:
-		f = "0x%02x"
-	case u <= 0xffff:
-		f = "0x%04x"
-	case u <= 0xffffff:
-		f = "0x%06x"
-	case u <= 0xffffffff:
-		f = "0x%08x"
-	case u <= 0xffffffffff:
-		f = "0x%010x"
-	case u <= 0xffffffffffff:
-		f = "0x%012x"
-	case u <= 0xffffffffffffff:
-		f = "0x%014x"
-	case u <= 0xffffffffffffffff:
-		f = "0x%016x"
-	}
-	return fmt.Sprintf(f, u)
-}
-
-// insertPointer insert p into m, allocating m if necessary.
-func insertPointer(m map[uintptr]bool, p uintptr) map[uintptr]bool {
-	if m == nil {
-		m = make(map[uintptr]bool)
-	}
-	m[p] = true
-	return m
-}
-
-// isZero reports whether v is the zero value.
-// This does not rely on Interface and so can be used on unexported fields.
-func isZero(v reflect.Value) bool {
-	switch v.Kind() {
-	case reflect.Bool:
-		return v.Bool() == false
-	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
-		return v.Int() == 0
-	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
-		return v.Uint() == 0
-	case reflect.Float32, reflect.Float64:
-		return v.Float() == 0
-	case reflect.Complex64, reflect.Complex128:
-		return v.Complex() == 0
-	case reflect.String:
-		return v.String() == ""
-	case reflect.UnsafePointer:
-		return v.Pointer() == 0
-	case reflect.Chan, reflect.Func, reflect.Interface, reflect.Ptr, reflect.Map, reflect.Slice:
-		return v.IsNil()
-	case reflect.Array:
-		for i := 0; i < v.Len(); i++ {
-			if !isZero(v.Index(i)) {
-				return false
-			}
-		}
-		return true
-	case reflect.Struct:
-		for i := 0; i < v.NumField(); i++ {
-			if !isZero(v.Field(i)) {
-				return false
-			}
-		}
-		return true
-	}
-	return false
-}
diff --git a/vendor/github.com/google/go-cmp/cmp/internal/value/sort.go b/vendor/github.com/google/go-cmp/cmp/internal/value/sort.go
deleted file mode 100644
index fe8aa27a..00000000
--- a/vendor/github.com/google/go-cmp/cmp/internal/value/sort.go
+++ /dev/null
@@ -1,111 +0,0 @@
-// Copyright 2017, The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE.md file.
-
-package value
-
-import (
-	"fmt"
-	"math"
-	"reflect"
-	"sort"
-)
-
-// SortKeys sorts a list of map keys, deduplicating keys if necessary.
-// The type of each value must be comparable.
-func SortKeys(vs []reflect.Value) []reflect.Value {
-	if len(vs) == 0 {
-		return vs
-	}
-
-	// Sort the map keys.
-	sort.Sort(valueSorter(vs))
-
-	// Deduplicate keys (fails for NaNs).
-	vs2 := vs[:1]
-	for _, v := range vs[1:] {
-		if isLess(vs2[len(vs2)-1], v) {
-			vs2 = append(vs2, v)
-		}
-	}
-	return vs2
-}
-
-// TODO: Use sort.Slice once Google AppEngine is on Go1.8 or above.
-type valueSorter []reflect.Value
-
-func (vs valueSorter) Len() int           { return len(vs) }
-func (vs valueSorter) Less(i, j int) bool { return isLess(vs[i], vs[j]) }
-func (vs valueSorter) Swap(i, j int)      { vs[i], vs[j] = vs[j], vs[i] }
-
-// isLess is a generic function for sorting arbitrary map keys.
-// The inputs must be of the same type and must be comparable.
-func isLess(x, y reflect.Value) bool {
-	switch x.Type().Kind() {
-	case reflect.Bool:
-		return !x.Bool() && y.Bool()
-	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
-		return x.Int() < y.Int()
-	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
-		return x.Uint() < y.Uint()
-	case reflect.Float32, reflect.Float64:
-		fx, fy := x.Float(), y.Float()
-		return fx < fy || math.IsNaN(fx) && !math.IsNaN(fy)
-	case reflect.Complex64, reflect.Complex128:
-		cx, cy := x.Complex(), y.Complex()
-		rx, ix, ry, iy := real(cx), imag(cx), real(cy), imag(cy)
-		if rx == ry || (math.IsNaN(rx) && math.IsNaN(ry)) {
-			return ix < iy || math.IsNaN(ix) && !math.IsNaN(iy)
-		}
-		return rx < ry || math.IsNaN(rx) && !math.IsNaN(ry)
-	case reflect.Ptr, reflect.UnsafePointer, reflect.Chan:
-		return x.Pointer() < y.Pointer()
-	case reflect.String:
-		return x.String() < y.String()
-	case reflect.Array:
-		for i := 0; i < x.Len(); i++ {
-			if isLess(x.Index(i), y.Index(i)) {
-				return true
-			}
-			if isLess(y.Index(i), x.Index(i)) {
-				return false
-			}
-		}
-		return false
-	case reflect.Struct:
-		for i := 0; i < x.NumField(); i++ {
-			if isLess(x.Field(i), y.Field(i)) {
-				return true
-			}
-			if isLess(y.Field(i), x.Field(i)) {
-				return false
-			}
-		}
-		return false
-	case reflect.Interface:
-		vx, vy := x.Elem(), y.Elem()
-		if !vx.IsValid() || !vy.IsValid() {
-			return !vx.IsValid() && vy.IsValid()
-		}
-		tx, ty := vx.Type(), vy.Type()
-		if tx == ty {
-			return isLess(x.Elem(), y.Elem())
-		}
-		if tx.Kind() != ty.Kind() {
-			return vx.Kind() < vy.Kind()
-		}
-		if tx.String() != ty.String() {
-			return tx.String() < ty.String()
-		}
-		if tx.PkgPath() != ty.PkgPath() {
-			return tx.PkgPath() < ty.PkgPath()
-		}
-		// This can happen in rare situations, so we fallback to just comparing
-		// the unique pointer for a reflect.Type. This guarantees deterministic
-		// ordering within a program, but it is obviously not stable.
-		return reflect.ValueOf(vx.Type()).Pointer() < reflect.ValueOf(vy.Type()).Pointer()
-	default:
-		// Must be Func, Map, or Slice; which are not comparable.
-		panic(fmt.Sprintf("%T is not comparable", x.Type()))
-	}
-}
diff --git a/vendor/github.com/google/go-cmp/cmp/options.go b/vendor/github.com/google/go-cmp/cmp/options.go
deleted file mode 100644
index 91d4b066..00000000
--- a/vendor/github.com/google/go-cmp/cmp/options.go
+++ /dev/null
@@ -1,453 +0,0 @@
-// Copyright 2017, The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE.md file.
-
-package cmp
-
-import (
-	"fmt"
-	"reflect"
-	"runtime"
-	"strings"
-
-	"github.com/google/go-cmp/cmp/internal/function"
-)
-
-// Option configures for specific behavior of Equal and Diff. In particular,
-// the fundamental Option functions (Ignore, Transformer, and Comparer),
-// configure how equality is determined.
-//
-// The fundamental options may be composed with filters (FilterPath and
-// FilterValues) to control the scope over which they are applied.
-//
-// The cmp/cmpopts package provides helper functions for creating options that
-// may be used with Equal and Diff.
-type Option interface {
-	// filter applies all filters and returns the option that remains.
-	// Each option may only read s.curPath and call s.callTTBFunc.
-	//
-	// An Options is returned only if multiple comparers or transformers
-	// can apply simultaneously and will only contain values of those types
-	// or sub-Options containing values of those types.
-	filter(s *state, vx, vy reflect.Value, t reflect.Type) applicableOption
-}
-
-// applicableOption represents the following types:
-//	Fundamental: ignore | invalid | *comparer | *transformer
-//	Grouping:    Options
-type applicableOption interface {
-	Option
-
-	// apply executes the option, which may mutate s or panic.
-	apply(s *state, vx, vy reflect.Value)
-}
-
-// coreOption represents the following types:
-//	Fundamental: ignore | invalid | *comparer | *transformer
-//	Filters:     *pathFilter | *valuesFilter
-type coreOption interface {
-	Option
-	isCore()
-}
-
-type core struct{}
-
-func (core) isCore() {}
-
-// Options is a list of Option values that also satisfies the Option interface.
-// Helper comparison packages may return an Options value when packing multiple
-// Option values into a single Option. When this package processes an Options,
-// it will be implicitly expanded into a flat list.
-//
-// Applying a filter on an Options is equivalent to applying that same filter
-// on all individual options held within.
-type Options []Option
-
-func (opts Options) filter(s *state, vx, vy reflect.Value, t reflect.Type) (out applicableOption) {
-	for _, opt := range opts {
-		switch opt := opt.filter(s, vx, vy, t); opt.(type) {
-		case ignore:
-			return ignore{} // Only ignore can short-circuit evaluation
-		case invalid:
-			out = invalid{} // Takes precedence over comparer or transformer
-		case *comparer, *transformer, Options:
-			switch out.(type) {
-			case nil:
-				out = opt
-			case invalid:
-				// Keep invalid
-			case *comparer, *transformer, Options:
-				out = Options{out, opt} // Conflicting comparers or transformers
-			}
-		}
-	}
-	return out
-}
-
-func (opts Options) apply(s *state, _, _ reflect.Value) {
-	const warning = "ambiguous set of applicable options"
-	const help = "consider using filters to ensure at most one Comparer or Transformer may apply"
-	var ss []string
-	for _, opt := range flattenOptions(nil, opts) {
-		ss = append(ss, fmt.Sprint(opt))
-	}
-	set := strings.Join(ss, "\n\t")
-	panic(fmt.Sprintf("%s at %#v:\n\t%s\n%s", warning, s.curPath, set, help))
-}
-
-func (opts Options) String() string {
-	var ss []string
-	for _, opt := range opts {
-		ss = append(ss, fmt.Sprint(opt))
-	}
-	return fmt.Sprintf("Options{%s}", strings.Join(ss, ", "))
-}
-
-// FilterPath returns a new Option where opt is only evaluated if filter f
-// returns true for the current Path in the value tree.
-//
-// The option passed in may be an Ignore, Transformer, Comparer, Options, or
-// a previously filtered Option.
-func FilterPath(f func(Path) bool, opt Option) Option {
-	if f == nil {
-		panic("invalid path filter function")
-	}
-	if opt := normalizeOption(opt); opt != nil {
-		return &pathFilter{fnc: f, opt: opt}
-	}
-	return nil
-}
-
-type pathFilter struct {
-	core
-	fnc func(Path) bool
-	opt Option
-}
-
-func (f pathFilter) filter(s *state, vx, vy reflect.Value, t reflect.Type) applicableOption {
-	if f.fnc(s.curPath) {
-		return f.opt.filter(s, vx, vy, t)
-	}
-	return nil
-}
-
-func (f pathFilter) String() string {
-	fn := getFuncName(reflect.ValueOf(f.fnc).Pointer())
-	return fmt.Sprintf("FilterPath(%s, %v)", fn, f.opt)
-}
-
-// FilterValues returns a new Option where opt is only evaluated if filter f,
-// which is a function of the form "func(T, T) bool", returns true for the
-// current pair of values being compared. If the type of the values is not
-// assignable to T, then this filter implicitly returns false.
-//
-// The filter function must be
-// symmetric (i.e., agnostic to the order of the inputs) and
-// deterministic (i.e., produces the same result when given the same inputs).
-// If T is an interface, it is possible that f is called with two values with
-// different concrete types that both implement T.
-//
-// The option passed in may be an Ignore, Transformer, Comparer, Options, or
-// a previously filtered Option.
-func FilterValues(f interface{}, opt Option) Option {
-	v := reflect.ValueOf(f)
-	if !function.IsType(v.Type(), function.ValueFilter) || v.IsNil() {
-		panic(fmt.Sprintf("invalid values filter function: %T", f))
-	}
-	if opt := normalizeOption(opt); opt != nil {
-		vf := &valuesFilter{fnc: v, opt: opt}
-		if ti := v.Type().In(0); ti.Kind() != reflect.Interface || ti.NumMethod() > 0 {
-			vf.typ = ti
-		}
-		return vf
-	}
-	return nil
-}
-
-type valuesFilter struct {
-	core
-	typ reflect.Type  // T
-	fnc reflect.Value // func(T, T) bool
-	opt Option
-}
-
-func (f valuesFilter) filter(s *state, vx, vy reflect.Value, t reflect.Type) applicableOption {
-	if !vx.IsValid() || !vy.IsValid() {
-		return invalid{}
-	}
-	if (f.typ == nil || t.AssignableTo(f.typ)) && s.callTTBFunc(f.fnc, vx, vy) {
-		return f.opt.filter(s, vx, vy, t)
-	}
-	return nil
-}
-
-func (f valuesFilter) String() string {
-	fn := getFuncName(f.fnc.Pointer())
-	return fmt.Sprintf("FilterValues(%s, %v)", fn, f.opt)
-}
-
-// Ignore is an Option that causes all comparisons to be ignored.
-// This value is intended to be combined with FilterPath or FilterValues.
-// It is an error to pass an unfiltered Ignore option to Equal.
-func Ignore() Option { return ignore{} }
-
-type ignore struct{ core }
-
-func (ignore) isFiltered() bool                                                     { return false }
-func (ignore) filter(_ *state, _, _ reflect.Value, _ reflect.Type) applicableOption { return ignore{} }
-func (ignore) apply(_ *state, _, _ reflect.Value)                                   { return }
-func (ignore) String() string                                                       { return "Ignore()" }
-
-// invalid is a sentinel Option type to indicate that some options could not
-// be evaluated due to unexported fields.
-type invalid struct{ core }
-
-func (invalid) filter(_ *state, _, _ reflect.Value, _ reflect.Type) applicableOption { return invalid{} }
-func (invalid) apply(s *state, _, _ reflect.Value) {
-	const help = "consider using AllowUnexported or cmpopts.IgnoreUnexported"
-	panic(fmt.Sprintf("cannot handle unexported field: %#v\n%s", s.curPath, help))
-}
-
-// Transformer returns an Option that applies a transformation function that
-// converts values of a certain type into that of another.
-//
-// The transformer f must be a function "func(T) R" that converts values of
-// type T to those of type R and is implicitly filtered to input values
-// assignable to T. The transformer must not mutate T in any way.
-//
-// To help prevent some cases of infinite recursive cycles applying the
-// same transform to the output of itself (e.g., in the case where the
-// input and output types are the same), an implicit filter is added such that
-// a transformer is applicable only if that exact transformer is not already
-// in the tail of the Path since the last non-Transform step.
-//
-// The name is a user provided label that is used as the Transform.Name in the
-// transformation PathStep. If empty, an arbitrary name is used.
-func Transformer(name string, f interface{}) Option {
-	v := reflect.ValueOf(f)
-	if !function.IsType(v.Type(), function.Transformer) || v.IsNil() {
-		panic(fmt.Sprintf("invalid transformer function: %T", f))
-	}
-	if name == "" {
-		name = "λ" // Lambda-symbol as place-holder for anonymous transformer
-	}
-	if !isValid(name) {
-		panic(fmt.Sprintf("invalid name: %q", name))
-	}
-	tr := &transformer{name: name, fnc: reflect.ValueOf(f)}
-	if ti := v.Type().In(0); ti.Kind() != reflect.Interface || ti.NumMethod() > 0 {
-		tr.typ = ti
-	}
-	return tr
-}
-
-type transformer struct {
-	core
-	name string
-	typ  reflect.Type  // T
-	fnc  reflect.Value // func(T) R
-}
-
-func (tr *transformer) isFiltered() bool { return tr.typ != nil }
-
-func (tr *transformer) filter(s *state, _, _ reflect.Value, t reflect.Type) applicableOption {
-	for i := len(s.curPath) - 1; i >= 0; i-- {
-		if t, ok := s.curPath[i].(*transform); !ok {
-			break // Hit most recent non-Transform step
-		} else if tr == t.trans {
-			return nil // Cannot directly use same Transform
-		}
-	}
-	if tr.typ == nil || t.AssignableTo(tr.typ) {
-		return tr
-	}
-	return nil
-}
-
-func (tr *transformer) apply(s *state, vx, vy reflect.Value) {
-	// Update path before calling the Transformer so that dynamic checks
-	// will use the updated path.
-	s.curPath.push(&transform{pathStep{tr.fnc.Type().Out(0)}, tr})
-	defer s.curPath.pop()
-
-	vx = s.callTRFunc(tr.fnc, vx)
-	vy = s.callTRFunc(tr.fnc, vy)
-	s.compareAny(vx, vy)
-}
-
-func (tr transformer) String() string {
-	return fmt.Sprintf("Transformer(%s, %s)", tr.name, getFuncName(tr.fnc.Pointer()))
-}
-
-// Comparer returns an Option that determines whether two values are equal
-// to each other.
-//
-// The comparer f must be a function "func(T, T) bool" and is implicitly
-// filtered to input values assignable to T. If T is an interface, it is
-// possible that f is called with two values of different concrete types that
-// both implement T.
-//
-// The equality function must be:
-//	• Symmetric: equal(x, y) == equal(y, x)
-//	• Deterministic: equal(x, y) == equal(x, y)
-//	• Pure: equal(x, y) does not modify x or y
-func Comparer(f interface{}) Option {
-	v := reflect.ValueOf(f)
-	if !function.IsType(v.Type(), function.Equal) || v.IsNil() {
-		panic(fmt.Sprintf("invalid comparer function: %T", f))
-	}
-	cm := &comparer{fnc: v}
-	if ti := v.Type().In(0); ti.Kind() != reflect.Interface || ti.NumMethod() > 0 {
-		cm.typ = ti
-	}
-	return cm
-}
-
-type comparer struct {
-	core
-	typ reflect.Type  // T
-	fnc reflect.Value // func(T, T) bool
-}
-
-func (cm *comparer) isFiltered() bool { return cm.typ != nil }
-
-func (cm *comparer) filter(_ *state, _, _ reflect.Value, t reflect.Type) applicableOption {
-	if cm.typ == nil || t.AssignableTo(cm.typ) {
-		return cm
-	}
-	return nil
-}
-
-func (cm *comparer) apply(s *state, vx, vy reflect.Value) {
-	eq := s.callTTBFunc(cm.fnc, vx, vy)
-	s.report(eq, vx, vy)
-}
-
-func (cm comparer) String() string {
-	return fmt.Sprintf("Comparer(%s)", getFuncName(cm.fnc.Pointer()))
-}
-
-// AllowUnexported returns an Option that forcibly allows operations on
-// unexported fields in certain structs, which are specified by passing in a
-// value of each struct type.
-//
-// Users of this option must understand that comparing on unexported fields
-// from external packages is not safe since changes in the internal
-// implementation of some external package may cause the result of Equal
-// to unexpectedly change. However, it may be valid to use this option on types
-// defined in an internal package where the semantic meaning of an unexported
-// field is in the control of the user.
-//
-// For some cases, a custom Comparer should be used instead that defines
-// equality as a function of the public API of a type rather than the underlying
-// unexported implementation.
-//
-// For example, the reflect.Type documentation defines equality to be determined
-// by the == operator on the interface (essentially performing a shallow pointer
-// comparison) and most attempts to compare *regexp.Regexp types are interested
-// in only checking that the regular expression strings are equal.
-// Both of these are accomplished using Comparers:
-//
-//	Comparer(func(x, y reflect.Type) bool { return x == y })
-//	Comparer(func(x, y *regexp.Regexp) bool { return x.String() == y.String() })
-//
-// In other cases, the cmpopts.IgnoreUnexported option can be used to ignore
-// all unexported fields on specified struct types.
-func AllowUnexported(types ...interface{}) Option {
-	if !supportAllowUnexported {
-		panic("AllowUnexported is not supported on purego builds, Google App Engine Standard, or GopherJS")
-	}
-	m := make(map[reflect.Type]bool)
-	for _, typ := range types {
-		t := reflect.TypeOf(typ)
-		if t.Kind() != reflect.Struct {
-			panic(fmt.Sprintf("invalid struct type: %T", typ))
-		}
-		m[t] = true
-	}
-	return visibleStructs(m)
-}
-
-type visibleStructs map[reflect.Type]bool
-
-func (visibleStructs) filter(_ *state, _, _ reflect.Value, _ reflect.Type) applicableOption {
-	panic("not implemented")
-}
-
-// reporter is an Option that configures how differences are reported.
-type reporter interface {
-	// TODO: Not exported yet.
-	//
-	// Perhaps add PushStep and PopStep and change Report to only accept
-	// a PathStep instead of the full-path? Adding a PushStep and PopStep makes
-	// it clear that we are traversing the value tree in a depth-first-search
-	// manner, which has an effect on how values are printed.
-
-	Option
-
-	// Report is called for every comparison made and will be provided with
-	// the two values being compared, the equality result, and the
-	// current path in the value tree. It is possible for x or y to be an
-	// invalid reflect.Value if one of the values is non-existent;
-	// which is possible with maps and slices.
-	Report(x, y reflect.Value, eq bool, p Path)
-}
-
-// normalizeOption normalizes the input options such that all Options groups
-// are flattened and groups with a single element are reduced to that element.
-// Only coreOptions and Options containing coreOptions are allowed.
-func normalizeOption(src Option) Option {
-	switch opts := flattenOptions(nil, Options{src}); len(opts) {
-	case 0:
-		return nil
-	case 1:
-		return opts[0]
-	default:
-		return opts
-	}
-}
-
-// flattenOptions copies all options in src to dst as a flat list.
-// Only coreOptions and Options containing coreOptions are allowed.
-func flattenOptions(dst, src Options) Options {
-	for _, opt := range src {
-		switch opt := opt.(type) {
-		case nil:
-			continue
-		case Options:
-			dst = flattenOptions(dst, opt)
-		case coreOption:
-			dst = append(dst, opt)
-		default:
-			panic(fmt.Sprintf("invalid option type: %T", opt))
-		}
-	}
-	return dst
-}
-
-// getFuncName returns a short function name from the pointer.
-// The string parsing logic works up until Go1.9.
-func getFuncName(p uintptr) string {
-	fnc := runtime.FuncForPC(p)
-	if fnc == nil {
-		return "<unknown>"
-	}
-	name := fnc.Name() // E.g., "long/path/name/mypkg.(mytype).(long/path/name/mypkg.myfunc)-fm"
-	if strings.HasSuffix(name, ")-fm") || strings.HasSuffix(name, ")·fm") {
-		// Strip the package name from method name.
-		name = strings.TrimSuffix(name, ")-fm")
-		name = strings.TrimSuffix(name, ")·fm")
-		if i := strings.LastIndexByte(name, '('); i >= 0 {
-			methodName := name[i+1:] // E.g., "long/path/name/mypkg.myfunc"
-			if j := strings.LastIndexByte(methodName, '.'); j >= 0 {
-				methodName = methodName[j+1:] // E.g., "myfunc"
-			}
-			name = name[:i] + methodName // E.g., "long/path/name/mypkg.(mytype)." + "myfunc"
-		}
-	}
-	if i := strings.LastIndexByte(name, '/'); i >= 0 {
-		// Strip the package name.
-		name = name[i+1:] // E.g., "mypkg.(mytype).myfunc"
-	}
-	return name
-}
diff --git a/vendor/github.com/google/go-cmp/cmp/path.go b/vendor/github.com/google/go-cmp/cmp/path.go
deleted file mode 100644
index c08a3cf8..00000000
--- a/vendor/github.com/google/go-cmp/cmp/path.go
+++ /dev/null
@@ -1,309 +0,0 @@
-// Copyright 2017, The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE.md file.
-
-package cmp
-
-import (
-	"fmt"
-	"reflect"
-	"strings"
-	"unicode"
-	"unicode/utf8"
-)
-
-type (
-	// Path is a list of PathSteps describing the sequence of operations to get
-	// from some root type to the current position in the value tree.
-	// The first Path element is always an operation-less PathStep that exists
-	// simply to identify the initial type.
-	//
-	// When traversing structs with embedded structs, the embedded struct will
-	// always be accessed as a field before traversing the fields of the
-	// embedded struct themselves. That is, an exported field from the
-	// embedded struct will never be accessed directly from the parent struct.
-	Path []PathStep
-
-	// PathStep is a union-type for specific operations to traverse
-	// a value's tree structure. Users of this package never need to implement
-	// these types as values of this type will be returned by this package.
-	PathStep interface {
-		String() string
-		Type() reflect.Type // Resulting type after performing the path step
-		isPathStep()
-	}
-
-	// SliceIndex is an index operation on a slice or array at some index Key.
-	SliceIndex interface {
-		PathStep
-		Key() int // May return -1 if in a split state
-
-		// SplitKeys returns the indexes for indexing into slices in the
-		// x and y values, respectively. These indexes may differ due to the
-		// insertion or removal of an element in one of the slices, causing
-		// all of the indexes to be shifted. If an index is -1, then that
-		// indicates that the element does not exist in the associated slice.
-		//
-		// Key is guaranteed to return -1 if and only if the indexes returned
-		// by SplitKeys are not the same. SplitKeys will never return -1 for
-		// both indexes.
-		SplitKeys() (x int, y int)
-
-		isSliceIndex()
-	}
-	// MapIndex is an index operation on a map at some index Key.
-	MapIndex interface {
-		PathStep
-		Key() reflect.Value
-		isMapIndex()
-	}
-	// TypeAssertion represents a type assertion on an interface.
-	TypeAssertion interface {
-		PathStep
-		isTypeAssertion()
-	}
-	// StructField represents a struct field access on a field called Name.
-	StructField interface {
-		PathStep
-		Name() string
-		Index() int
-		isStructField()
-	}
-	// Indirect represents pointer indirection on the parent type.
-	Indirect interface {
-		PathStep
-		isIndirect()
-	}
-	// Transform is a transformation from the parent type to the current type.
-	Transform interface {
-		PathStep
-		Name() string
-		Func() reflect.Value
-
-		// Option returns the originally constructed Transformer option.
-		// The == operator can be used to detect the exact option used.
-		Option() Option
-
-		isTransform()
-	}
-)
-
-func (pa *Path) push(s PathStep) {
-	*pa = append(*pa, s)
-}
-
-func (pa *Path) pop() {
-	*pa = (*pa)[:len(*pa)-1]
-}
-
-// Last returns the last PathStep in the Path.
-// If the path is empty, this returns a non-nil PathStep that reports a nil Type.
-func (pa Path) Last() PathStep {
-	return pa.Index(-1)
-}
-
-// Index returns the ith step in the Path and supports negative indexing.
-// A negative index starts counting from the tail of the Path such that -1
-// refers to the last step, -2 refers to the second-to-last step, and so on.
-// If index is invalid, this returns a non-nil PathStep that reports a nil Type.
-func (pa Path) Index(i int) PathStep {
-	if i < 0 {
-		i = len(pa) + i
-	}
-	if i < 0 || i >= len(pa) {
-		return pathStep{}
-	}
-	return pa[i]
-}
-
-// String returns the simplified path to a node.
-// The simplified path only contains struct field accesses.
-//
-// For example:
-//	MyMap.MySlices.MyField
-func (pa Path) String() string {
-	var ss []string
-	for _, s := range pa {
-		if _, ok := s.(*structField); ok {
-			ss = append(ss, s.String())
-		}
-	}
-	return strings.TrimPrefix(strings.Join(ss, ""), ".")
-}
-
-// GoString returns the path to a specific node using Go syntax.
-//
-// For example:
-//	(*root.MyMap["key"].(*mypkg.MyStruct).MySlices)[2][3].MyField
-func (pa Path) GoString() string {
-	var ssPre, ssPost []string
-	var numIndirect int
-	for i, s := range pa {
-		var nextStep PathStep
-		if i+1 < len(pa) {
-			nextStep = pa[i+1]
-		}
-		switch s := s.(type) {
-		case *indirect:
-			numIndirect++
-			pPre, pPost := "(", ")"
-			switch nextStep.(type) {
-			case *indirect:
-				continue // Next step is indirection, so let them batch up
-			case *structField:
-				numIndirect-- // Automatic indirection on struct fields
-			case nil:
-				pPre, pPost = "", "" // Last step; no need for parenthesis
-			}
-			if numIndirect > 0 {
-				ssPre = append(ssPre, pPre+strings.Repeat("*", numIndirect))
-				ssPost = append(ssPost, pPost)
-			}
-			numIndirect = 0
-			continue
-		case *transform:
-			ssPre = append(ssPre, s.trans.name+"(")
-			ssPost = append(ssPost, ")")
-			continue
-		case *typeAssertion:
-			// As a special-case, elide type assertions on anonymous types
-			// since they are typically generated dynamically and can be very
-			// verbose. For example, some transforms return interface{} because
-			// of Go's lack of generics, but typically take in and return the
-			// exact same concrete type.
-			if s.Type().PkgPath() == "" {
-				continue
-			}
-		}
-		ssPost = append(ssPost, s.String())
-	}
-	for i, j := 0, len(ssPre)-1; i < j; i, j = i+1, j-1 {
-		ssPre[i], ssPre[j] = ssPre[j], ssPre[i]
-	}
-	return strings.Join(ssPre, "") + strings.Join(ssPost, "")
-}
-
-type (
-	pathStep struct {
-		typ reflect.Type
-	}
-
-	sliceIndex struct {
-		pathStep
-		xkey, ykey int
-	}
-	mapIndex struct {
-		pathStep
-		key reflect.Value
-	}
-	typeAssertion struct {
-		pathStep
-	}
-	structField struct {
-		pathStep
-		name string
-		idx  int
-
-		// These fields are used for forcibly accessing an unexported field.
-		// pvx, pvy, and field are only valid if unexported is true.
-		unexported bool
-		force      bool                // Forcibly allow visibility
-		pvx, pvy   reflect.Value       // Parent values
-		field      reflect.StructField // Field information
-	}
-	indirect struct {
-		pathStep
-	}
-	transform struct {
-		pathStep
-		trans *transformer
-	}
-)
-
-func (ps pathStep) Type() reflect.Type { return ps.typ }
-func (ps pathStep) String() string {
-	if ps.typ == nil {
-		return "<nil>"
-	}
-	s := ps.typ.String()
-	if s == "" || strings.ContainsAny(s, "{}\n") {
-		return "root" // Type too simple or complex to print
-	}
-	return fmt.Sprintf("{%s}", s)
-}
-
-func (si sliceIndex) String() string {
-	switch {
-	case si.xkey == si.ykey:
-		return fmt.Sprintf("[%d]", si.xkey)
-	case si.ykey == -1:
-		// [5->?] means "I don't know where X[5] went"
-		return fmt.Sprintf("[%d->?]", si.xkey)
-	case si.xkey == -1:
-		// [?->3] means "I don't know where Y[3] came from"
-		return fmt.Sprintf("[?->%d]", si.ykey)
-	default:
-		// [5->3] means "X[5] moved to Y[3]"
-		return fmt.Sprintf("[%d->%d]", si.xkey, si.ykey)
-	}
-}
-func (mi mapIndex) String() string      { return fmt.Sprintf("[%#v]", mi.key) }
-func (ta typeAssertion) String() string { return fmt.Sprintf(".(%v)", ta.typ) }
-func (sf structField) String() string   { return fmt.Sprintf(".%s", sf.name) }
-func (in indirect) String() string      { return "*" }
-func (tf transform) String() string     { return fmt.Sprintf("%s()", tf.trans.name) }
-
-func (si sliceIndex) Key() int {
-	if si.xkey != si.ykey {
-		return -1
-	}
-	return si.xkey
-}
-func (si sliceIndex) SplitKeys() (x, y int) { return si.xkey, si.ykey }
-func (mi mapIndex) Key() reflect.Value      { return mi.key }
-func (sf structField) Name() string         { return sf.name }
-func (sf structField) Index() int           { return sf.idx }
-func (tf transform) Name() string           { return tf.trans.name }
-func (tf transform) Func() reflect.Value    { return tf.trans.fnc }
-func (tf transform) Option() Option         { return tf.trans }
-
-func (pathStep) isPathStep()           {}
-func (sliceIndex) isSliceIndex()       {}
-func (mapIndex) isMapIndex()           {}
-func (typeAssertion) isTypeAssertion() {}
-func (structField) isStructField()     {}
-func (indirect) isIndirect()           {}
-func (transform) isTransform()         {}
-
-var (
-	_ SliceIndex    = sliceIndex{}
-	_ MapIndex      = mapIndex{}
-	_ TypeAssertion = typeAssertion{}
-	_ StructField   = structField{}
-	_ Indirect      = indirect{}
-	_ Transform     = transform{}
-
-	_ PathStep = sliceIndex{}
-	_ PathStep = mapIndex{}
-	_ PathStep = typeAssertion{}
-	_ PathStep = structField{}
-	_ PathStep = indirect{}
-	_ PathStep = transform{}
-)
-
-// isExported reports whether the identifier is exported.
-func isExported(id string) bool {
-	r, _ := utf8.DecodeRuneInString(id)
-	return unicode.IsUpper(r)
-}
-
-// isValid reports whether the identifier is valid.
-// Empty and underscore-only strings are not valid.
-func isValid(id string) bool {
-	ok := id != "" && id != "_"
-	for j, c := range id {
-		ok = ok && (j > 0 || !unicode.IsDigit(c))
-		ok = ok && (c == '_' || unicode.IsLetter(c) || unicode.IsDigit(c))
-	}
-	return ok
-}
diff --git a/vendor/github.com/google/go-cmp/cmp/reporter.go b/vendor/github.com/google/go-cmp/cmp/reporter.go
deleted file mode 100644
index 20e9f18e..00000000
--- a/vendor/github.com/google/go-cmp/cmp/reporter.go
+++ /dev/null
@@ -1,53 +0,0 @@
-// Copyright 2017, The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE.md file.
-
-package cmp
-
-import (
-	"fmt"
-	"reflect"
-	"strings"
-
-	"github.com/google/go-cmp/cmp/internal/value"
-)
-
-type defaultReporter struct {
-	Option
-	diffs  []string // List of differences, possibly truncated
-	ndiffs int      // Total number of differences
-	nbytes int      // Number of bytes in diffs
-	nlines int      // Number of lines in diffs
-}
-
-var _ reporter = (*defaultReporter)(nil)
-
-func (r *defaultReporter) Report(x, y reflect.Value, eq bool, p Path) {
-	if eq {
-		return // Ignore equal results
-	}
-	const maxBytes = 4096
-	const maxLines = 256
-	r.ndiffs++
-	if r.nbytes < maxBytes && r.nlines < maxLines {
-		sx := value.Format(x, value.FormatConfig{UseStringer: true})
-		sy := value.Format(y, value.FormatConfig{UseStringer: true})
-		if sx == sy {
-			// Unhelpful output, so use more exact formatting.
-			sx = value.Format(x, value.FormatConfig{PrintPrimitiveType: true})
-			sy = value.Format(y, value.FormatConfig{PrintPrimitiveType: true})
-		}
-		s := fmt.Sprintf("%#v:\n\t-: %s\n\t+: %s\n", p, sx, sy)
-		r.diffs = append(r.diffs, s)
-		r.nbytes += len(s)
-		r.nlines += strings.Count(s, "\n")
-	}
-}
-
-func (r *defaultReporter) String() string {
-	s := strings.Join(r.diffs, "")
-	if r.ndiffs == len(r.diffs) {
-		return s
-	}
-	return fmt.Sprintf("%s... %d more differences ...", s, r.ndiffs-len(r.diffs))
-}
diff --git a/vendor/github.com/google/go-cmp/cmp/unsafe_panic.go b/vendor/github.com/google/go-cmp/cmp/unsafe_panic.go
deleted file mode 100644
index d1518eb3..00000000
--- a/vendor/github.com/google/go-cmp/cmp/unsafe_panic.go
+++ /dev/null
@@ -1,15 +0,0 @@
-// Copyright 2017, The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE.md file.
-
-// +build purego appengine js
-
-package cmp
-
-import "reflect"
-
-const supportAllowUnexported = false
-
-func unsafeRetrieveField(reflect.Value, reflect.StructField) reflect.Value {
-	panic("unsafeRetrieveField is not implemented")
-}
diff --git a/vendor/github.com/google/go-cmp/cmp/unsafe_reflect.go b/vendor/github.com/google/go-cmp/cmp/unsafe_reflect.go
deleted file mode 100644
index 579b6550..00000000
--- a/vendor/github.com/google/go-cmp/cmp/unsafe_reflect.go
+++ /dev/null
@@ -1,23 +0,0 @@
-// Copyright 2017, The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE.md file.
-
-// +build !purego,!appengine,!js
-
-package cmp
-
-import (
-	"reflect"
-	"unsafe"
-)
-
-const supportAllowUnexported = true
-
-// unsafeRetrieveField uses unsafe to forcibly retrieve any field from a struct
-// such that the value has read-write permissions.
-//
-// The parent struct, v, must be addressable, while f must be a StructField
-// describing the field to retrieve.
-func unsafeRetrieveField(v reflect.Value, f reflect.StructField) reflect.Value {
-	return reflect.NewAt(f.Type, unsafe.Pointer(v.UnsafeAddr()+f.Offset)).Elem()
-}