=head2 Regular Expressions and String Escapes
-=head3 C<\cI<X>>
-
-The backslash-c construct was designed as a way of specifying
-non-printable characters, but there were no restrictions (on ASCII
-platforms) on what the character following the C<c> could be. Now, that
-character must be one of the ASCII characters.
-
=head3 \400-\777
Use of C<\400>-C<\777> in regexes in certain circumstances has given
example, C<< m/foo/sand $bar >> will still be parsed
as C<< m/foo/s and $bar >> but will issue a warning.
+=head2 C<\cI<X>>
+
+The backslash-c construct was designed as a way of specifying
+non-printable characters, but there were no restrictions (on ASCII
+platforms) on what the character following the C<c> could be. Now,
+a deprecation warning is raised if that character isn't an ASCII character.
+Also, a deprecation warning is raised for C<"\c{"> (which is the same
+as simply saying C<";">).
+
=head2 Deprecation warning added for deprecated-in-core .pl libs
This is a mandatory warning, not obeying -X or lexical warning bits.