1 files changed, 10 insertions, 0 deletions
diff --git a/test/compress/functions.js b/test/compress/functions.js
index 29c438ae..5d0be0f9 100644
--- a/test/compress/functions.js
+++ b/test/compress/functions.js
@@ -2012,3 +2012,13 @@ issue_2898: {
     }
     expect_stdout: "2"
 }
+
+deduplicate_parenthesis: {
+    input: {
+        ({}).a = b;
+        (({}).a = b)();
+        (function() {}).a = b;
+        ((function() {}).a = b)();
+    }
+    expect_exact: "({}).a=b;({}.a=b)();(function(){}).a=b;(function(){}.a=b)();"
+}