fix corner case in unused (#4338)

fixes #4337
2020-12-07 05:23:53 +00:00
parent 499f8d89ff
commit 6b603e1a62
2 changed files with 24 additions and 0 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -6269,6 +6269,7 @@ merge(Compressor.prototype, {
            }
            return this;
        });
+        def(AST_AsyncFunction, return_null);
        def(AST_Binary, function(compressor, first_in_statement) {
            if (this.operator == "in" && !is_object(this.right)) {
                var left = this.left.drop_side_effect_free(compressor, first_in_statement);