make diagnostic on C<my $^I> etc., more readable

p4raw-id: //depot/perl@3627

diff --git a/op.c b/op.c
index 44700dd..e1d6976 100644 (file)
--- a/op.c
+++ b/op.c
@@ -142,7 +142,7 @@ Perl_pad_allocmy(pTHX_ char *name)
        (PL_hints & HINT_UTF8 && (name[1] & 0xc0) == 0xc0) ||
        name[1] == '_' && (int)strlen(name) > 2))
     {
-       if (!isPRINT(name[1])) {
+       if (!isPRINT(name[1]) || strchr("\t\n\r\f", name[1])) {
            /* 1999-02-27 mjd@plover.com */
            char *p;
            p = strchr(name, '\0');