fix corner case in dead_code & ie8 (#3494)

fixes #3493
2019-10-17 09:58:05 +08:00
parent b1279a46d9
commit 0785a15ace
2 changed files with 76 additions and 2 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -888,8 +888,10 @@ merge(Compressor.prototype, {
    });

    AST_SymbolRef.DEFMETHOD("is_immutable", function() {
-        var orig = this.definition().orig;
-        return orig.length == 1 && orig[0] instanceof AST_SymbolLambda;
+        var def = this.definition();
+        if (def.orig.length != 1) return false;
+        var sym = def.orig[0];
+        return sym instanceof AST_SymbolLambda && def.scope.name === sym;
    });

    function is_lhs_read_only(lhs, compressor) {