Fix labeled brace source annotation harder (352415, r=mrbkap).

js/src/jsemit.c

@@ -5087,11 +5087,12 @@ js_EmitTree(JSContext *cx, JSCodeGenerator *cg, JSParseNode *pn)
         if (!ale)
             return JS_FALSE;
         pn2 = pn->pn_expr;
-        noteIndex = js_NewSrcNote2(cx, cg,
-                                   (pn2->pn_type == TOK_LC ||
-                                    pn2->pn_type == TOK_LEXICALSCOPE)
-                                   ? SRC_LABELBRACE
-                                   : SRC_LABEL,
+        noteType = (pn2->pn_type == TOK_LC ||
+                    (pn2->pn_type == TOK_LEXICALSCOPE &&
+                     pn2->pn_expr->pn_type == TOK_LC))
+                   ? SRC_LABELBRACE
+                   : SRC_LABEL;
+        noteIndex = js_NewSrcNote2(cx, cg, noteType,
                                    (ptrdiff_t) ALE_INDEX(ale));
         if (noteIndex < 0 ||
             js_Emit1(cx, cg, JSOP_NOP) < 0) {
@@ -5108,7 +5109,7 @@ js_EmitTree(JSContext *cx, JSCodeGenerator *cg, JSParseNode *pn)
             return JS_FALSE;
 
         /* If the statement was compound, emit a note for the end brace. */
-        if (pn2->pn_type == TOK_LC || pn2->pn_type == TOK_LEXICALSCOPE) {
+        if (noteType == SRC_LABELBRACE) {
             if (js_NewSrcNote(cx, cg, SRC_ENDBRACE) < 0 ||
                 js_Emit1(cx, cg, JSOP_NOP) < 0) {
                 return JS_FALSE;