fix corner case in arguments & reduce_vars (#3331)

fixes #3282
2019-03-13 08:46:03 +08:00
parent e250396d7e
commit d4ac84b255
2 changed files with 174 additions and 2 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -6334,8 +6334,8 @@ merge(Compressor.prototype, {
            && expr instanceof AST_SymbolRef
            && expr.name == "arguments"
            && expr.definition().orig.length == 1
-            && (fn = expr.scope) instanceof AST_Lambda
-            && prop instanceof AST_Number) {
+            && prop instanceof AST_Number
+            && (fn = expr.scope) === compressor.find_parent(AST_Lambda)) {
            var index = prop.getValue();
            var argname = fn.argnames[index];
            if (argname && compressor.has_directive("use strict")) {