avoid seg fault when return type is unknown

Fixes #80. R=ken https://golang.org/cl/154079
golang · Nov 12, 2009 · e5636d6 · e5636d6
1 parent 8b95720
commit e5636d6
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/src/cmd/gc/subr.c b/src/cmd/gc/subr.c
@@ -1138,6 +1138,11 @@ Tpretty(Fmt *fp, Type *t)
 			break;
 		case 1:
 			t1 = getoutargx(t)->type;
+			if(t1 == T) {
+				// failure to typecheck earlier; don't know the type
+				fmtprint(fp, " ?unknown-type?");
+				break;
+			}
 			if(t1->etype != TFIELD && t1->etype != TFUNC) {
 				fmtprint(fp, " %T", t1);
 				break;