compiler falut for forgetting

the assignment on a type switch R=r OCL=27048 CL=27048

compiler falut for forgetting
the assignment on a type switch R=r OCL=27048 CL=27048
9efd6b8a · Ken Thompson · 58f5f4f1 · 9efd6b8a
Commit 9efd6b8a authored Apr 03, 2009 by Ken Thompson
Hide whitespace changes
Inline Side-by-side

Showing with 7 additions and 0 deletions

swt.c src/cmd/gc/swt.c +7 -0

No files found.
--- a/src/cmd/gc/swt.c
+++ b/src/cmd/gc/swt.c
@@ -763,6 +763,13 @@ typeswitch(Node *sw)
 	Case *c, *c0, *c1;
 	int ncase;

+	if(sw->ntest == nil)
+		return;
+	if(sw->ntest->right == nil) {
+		setlineno(sw);
+		yyerror("type switch must have an assignment");
+		return;
+	}
 	walktype(sw->ntest->right, Erv);
 	if(!istype(sw->ntest->right->type, TINTER)) {
 		yyerror("type switch must be on an interface");