fix corner case in side_effects (#5024)

fixes #5023
2021-06-22 17:36:07 +01:00
parent 7c5b6f349e
commit 95090dbf24
2 changed files with 47 additions and 1 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -5275,7 +5275,7 @@ merge(Compressor.prototype, {
                || any(this.body, compressor);
        });
        def(AST_SymbolRef, function(compressor) {
-            return !this.is_declared(compressor);
+            return !this.is_declared(compressor) || !can_drop_symbol(this, compressor);
        });
        def(AST_Template, function(compressor) {
            if (any(this.expressions, compressor)) return true;