Style message about legacy man(7) date format in mdoc(7) documents

and operating system dependent messages about missing or unexpected
Mdocdate; inspired by mdoclint(1).

1 files changed, 3 insertions, 0 deletions

diff --git a/read.c b/read.c
index 0db43ef3..3db68fa1 100644
--- a/read.c
+++ b/read.c
@@ -88,6 +88,9 @@ static	const char * const	mandocerrs[MANDOCERR_MAX] = {
 
 	"generic style suggestion",
 
+	"Mdocdate found",
+	"Mdocdate missing",
+	"legacy man(7) date format",
 	"useless macro",
 	"consider using OS macro",
 	"errnos out of order",