fix corner cases in unused & varify (#4368)

fixes #4365
2020-12-11 20:45:35 +00:00
parent 4fdec765bc
commit 58dff9ada3
2 changed files with 29 additions and 1 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -7284,7 +7284,7 @@ merge(Compressor.prototype, {
    });

    function is_safe_lexical(def) {
-        return def.orig.length < (def.orig[0] instanceof AST_SymbolLambda ? 3 : 2);
+        return def.name != "arguments" && def.orig.length < (def.orig[0] instanceof AST_SymbolLambda ? 3 : 2);
    }

    function may_overlap(compressor, def) {