From: Alex Lam S.L <alexlamsl@gmail.com>
Date: Sat, 22 Aug 2020 17:03:48 +0000 (+0800)
Subject: enhance `comparisons` (#4062)
X-Git-Url: https://git.ndcode.org/public/gitweb.cgi?a=commitdiff_plain;h=f2d486e771271ce03f25a50a6107cb87735a681d;p=UglifyJS.git

enhance `comparisons` (#4062)
---

diff --git a/lib/compress.js b/lib/compress.js
index 595e5032..bcaecb8a 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -7112,7 +7112,7 @@ merge(Compressor.prototype, {
                 && self.right instanceof AST_SymbolRef
                 && self.left.definition() === self.right.definition()
                 && is_object(self.left)) {
-                return make_node(self.operator[0] == "=" ? AST_True : AST_False, self);
+                return make_node(self.operator[0] == "=" ? AST_True : AST_False, self).optimize(compressor);
             }
             break;
           case "&&":
diff --git a/test/compress/comparisons.js b/test/compress/comparisons.js
index f93ccbe1..a04498ee 100644
--- a/test/compress/comparisons.js
+++ b/test/compress/comparisons.js
@@ -123,6 +123,29 @@ self_comparison_3: {
     ]
 }
 
+self_comparison_4: {
+    options = {
+        booleans: true,
+        comparisons: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var o = {};
+        console.log(o == o, o != o);
+        console.log(o === o, o !== o);
+    }
+    expect: {
+        console.log(!0, !1);
+        console.log(!0, !1);
+    }
+    expect_stdout: [
+        "true false",
+        "true false",
+    ]
+}
+
 issue_2857_1: {
     options = {
         comparisons: true,