Deprecating the use of C<< \cI<X> >> to specify a printable character.

Starting in 5.14, we deprecated the use of "\cI<X>" when this
results in a printable character. For instance, "\c:" is just
a fancy way of writing "z". Starting in 5.28, this will be a
fatal error.

This also includes certain usage in regular expressions with the
experimental (?[ ]) construct, or when "use re 'strict'" is in
effect (also experimental).

1 files changed, 4 insertions, 4 deletions

diff --git a/dquote.c b/dquote.c
index e02308e7ac..ef030468c0 100644
--- a/dquote.c
+++ b/dquote.c
@@ -46,10 +46,10 @@ Perl_grok_bslash_c(pTHX_ const char source, const bool output_warning)
         clearer[i++] = result;
         clearer[i++] = '\0';
 
-        Perl_ck_warner(aTHX_ packWARN(WARN_SYNTAX),
-                        "\"\\c%c\" is more clearly written simply as \"%s\"",
-                        source,
-                        clearer);
+        Perl_ck_warner_d(aTHX_ packWARN2(WARN_SYNTAX,WARN_DEPRECATED),
+                          "\"\\c%c\" is more clearly written simply as \"%s\". "
+                          "This will be a fatal error in Perl 5.28",
+                          source, clearer);
     }
 
     return result;