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-rw-r--r--lib/compress.js2
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/compress.js b/lib/compress.js
index c6ebb34c..f4441775 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -2345,6 +2345,7 @@ merge(Compressor.prototype, {
if (expr.operator == "="
&& lhs instanceof AST_SymbolRef
&& (def = lhs.definition()).references[0] === lhs
+ && !(scope.uses_arguments && is_funarg(def))
&& !compressor.exposed(def)) {
var referenced = def.references.length - def.replaced;
if (referenced > 1) mangleable_var(expr.right);
@@ -2357,6 +2358,7 @@ merge(Compressor.prototype, {
var def = expr.name.definition();
if (def.const_redefs) return;
if (!member(expr.name, def.orig)) return;
+ if (scope.uses_arguments && is_funarg(def)) return;
var declared = def.orig.length - def.eliminated - (declare_only[def.name] || 0);
var referenced = def.references.length - def.replaced - (assignments[def.name] || 0);
if (declared > 1 && !(expr.name instanceof AST_SymbolFunarg)) {