fix corner case in arguments (#4400)

fixes #4399
2020-12-18 02:12:01 +00:00
parent 82d2aa4acf
commit 1b646d3bc4
3 changed files with 24 additions and 1 deletions
--- a/lib/ast.js
+++ b/lib/ast.js
@@ -1314,7 +1314,7 @@ var AST_Label = DEFNODE("Label", "references", {
    }
 }, AST_Symbol);

-var AST_SymbolRef = DEFNODE("SymbolRef", "fixed", {
+var AST_SymbolRef = DEFNODE("SymbolRef", "fixed in_arg", {
    $documentation: "Reference to some symbol (not definition/declaration)",
 }, AST_Symbol);

--- a/lib/compress.js
+++ b/lib/compress.js
@@ -9881,6 +9881,7 @@ merge(Compressor.prototype, {
        if (compressor.option("arguments")
            && expr instanceof AST_SymbolRef
            && is_arguments(def = expr.definition())
+            && !expr.in_arg
            && prop instanceof AST_Number
            && (fn = def.scope) === find_lambda()
            && fn.uses_arguments < (assigned ? 2 : 3)) {