Add new error "Can't use keyword '%s' as a label"

1 files changed, 6 insertions, 3 deletions

diff --git a/toke.c b/toke.c
index 554975a661..b264279a74 100644
--- a/toke.c
+++ b/toke.c
@@ -5275,17 +5275,20 @@ Perl_yylex(pTHX)
 	while (d < PL_bufend && isSPACE(*d))
 		d++;	/* no comments skipped here, or s### is misparsed */
 
-	/* Check for keywords */
-	tmp = keyword(PL_tokenbuf, len, 0);
-
 	/* Is this a label? */
 	if (!tmp && PL_expect == XSTATE
 	      && d < PL_bufend && *d == ':' && *(d + 1) != ':') {
+	    tmp = keyword(PL_tokenbuf, len, 0);
+	    if (tmp)
+		Perl_croak(aTHX_ "Can't use keyword '%s' as a label", PL_tokenbuf);
 	    s = d + 1;
 	    pl_yylval.pval = CopLABEL_alloc(PL_tokenbuf);
 	    CLINE;
 	    TOKEN(LABEL);
 	}
+	else
+	    /* Check for keywords */
+	    tmp = keyword(PL_tokenbuf, len, 0);
 
 	/* Is this a word before a => operator? */
 	if (*d == '=' && d[1] == '>') {