fix corner case in unused (#4134)

fixes #4133
2020-09-20 16:21:59 +01:00
parent ef3831437d
commit 90410f9fc3
2 changed files with 27 additions and 3 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -2906,9 +2906,12 @@ merge(Compressor.prototype, {
            var fixed = this.fixed_value();
            if (!fixed) return true;
            this._dot_throw = return_true;
-            var result = fixed._dot_throw(compressor);
-            delete this._dot_throw;
-            return result;
+            if (fixed._dot_throw(compressor)) {
+                delete this._dot_throw;
+                return true;
+            }
+            this._dot_throw = return_false;
+            return false;
        });
        def(AST_UnaryPrefix, function() {
            return this.operator == "void";