4 files changed, 58 insertions, 2 deletions

diff --git a/regress/mdoc/Op/Makefile b/regress/mdoc/Op/Makefile
index 4a2d6fda..b2a79566 100644
--- a/regress/mdoc/Op/Makefile
+++ b/regress/mdoc/Op/Makefile
@@ -1,6 +1,6 @@
-# $OpenBSD: Makefile,v 1.3 2014/07/02 11:42:56 schwarze Exp $
+# $OpenBSD: Makefile,v 1.7 2018/12/21 16:58:49 schwarze Exp $
 
-REGRESS_TARGETS	= break broken punct
+REGRESS_TARGETS	= arg break broken punct
 LINT_TARGETS	= break broken punct
 
 SKIP_GROFF	= break
diff --git a/regress/mdoc/Op/arg.in b/regress/mdoc/Op/arg.in
new file mode 100644
index 00000000..ed2ed567
--- /dev/null
+++ b/regress/mdoc/Op/arg.in
@@ -0,0 +1,20 @@
+.\" $OpenBSD: arg.in,v 1.1 2018/12/21 16:58:49 schwarze Exp $
+.Dd $Mdocdate$
+.Dt OP-ARG 1
+.Os
+.Sh NAME
+.Nm Op-arg
+.Nd escape sequences in the arguments of partial implicit macros
+.Sh DESCRIPTION
+.ds a \(at
+unquoted unescaped:
+.Op \*a
+.Pp
+quoted unescaped:
+.Op "\*a"
+.Pp
+unquoted escaped:
+.Op \\*a
+.Pp
+quoted escaped:
+.Op "\\*a"
diff --git a/regress/mdoc/Op/arg.out_ascii b/regress/mdoc/Op/arg.out_ascii
new file mode 100644
index 00000000..534917cb
--- /dev/null
+++ b/regress/mdoc/Op/arg.out_ascii
@@ -0,0 +1,15 @@
+OP-ARG(1)                   General Commands Manual                  OP-ARG(1)
+
+NNAAMMEE
+     OOpp--aarrgg - escape sequences in the arguments of partial implicit macros
+
+DDEESSCCRRIIPPTTIIOONN
+     unquoted unescaped: [@]
+
+     quoted unescaped: [@]
+
+     unquoted escaped: [@]
+
+     quoted escaped: [@]
+
+OpenBSD                        December 21, 2018                       OpenBSD
diff --git a/regress/mdoc/Op/arg.out_markdown b/regress/mdoc/Op/arg.out_markdown
new file mode 100644
index 00000000..5ad86f7d
--- /dev/null
+++ b/regress/mdoc/Op/arg.out_markdown
@@ -0,0 +1,21 @@
+OP-ARG(1) - General Commands Manual
+
+# NAME
+
+**Op-arg** - escape sequences in the arguments of partial implicit macros
+
+# DESCRIPTION
+
+unquoted unescaped:
+\[@]
+
+quoted unescaped:
+\[@]
+
+unquoted escaped:
+\[@]
+
+quoted escaped:
+\[@]
+
+OpenBSD - December 21, 2018