fix corner case in dead_code (#5107)

fixes #5106
2021-08-06 01:35:11 +01:00
parent 4fe2cac35e
commit fdcc6d3a9c
3 changed files with 38 additions and 1 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -11472,7 +11472,7 @@ merge(Compressor.prototype, {
                var local = scope === compressor.find_parent(AST_Lambda);
                var level = 0, node;
                parent = compressor.self();
-                do {
+                if (!(scope.uses_arguments && is_funarg(def)) || compressor.has_directive("use strict")) do {
                    node = parent;
                    parent = compressor.parent(level++);
                    if (parent instanceof AST_Assign) {