diff --git a/test/compress/reduce_vars.js b/test/compress/reduce_vars.js
index 19099424..994c0aee 100644
--- a/test/compress/reduce_vars.js
+++ b/test/compress/reduce_vars.js
@@ -2605,6 +2605,62 @@ accessor_2: {
     expect_stdout: "1"
 }
 
+method_1: {
+    options = {
+        evaluate: true,
+        reduce_vars: true,
+        toplevel: true,
+    }
+    input: {
+        var a = 1;
+        console.log(new class {
+            a() {
+                a = 2;
+                return a;
+            }
+        }().a(), a);
+    }
+    expect: {
+        var a = 1;
+        console.log(new class {
+            a() {
+                a = 2;
+                return a;
+            }
+        }().a(), a);
+    }
+    expect_stdout: "2 2"
+    node_version: ">=6"
+}
+
+method_2: {
+    options = {
+        collapse_vars: true,
+        evaluate: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var A = 1;
+        var B = class {
+            c() {
+                console.log(A);
+            }
+        };
+        new B().c();
+    }
+    expect: {
+        new class {
+            c() {
+                console.log(1);
+            }
+        }().c();
+    }
+    expect_stdout: "1"
+    node_version: ">=6"
+}
+
 issue_2090_1: {
     options = {
         evaluate: true,
diff --git a/test/mocha/minify.js b/test/mocha/minify.js
index 45f918a5..db32739b 100644
--- a/test/mocha/minify.js
+++ b/test/mocha/minify.js
@@ -76,6 +76,7 @@ describe("minify", function() {
     it("should not parse invalid use of reserved words", function() {
         assert.strictEqual(Uglify.minify("function enum(){}").error, undefined);
         assert.strictEqual(Uglify.minify("function static(){}").error, undefined);
+        assert.strictEqual(Uglify.minify("function super(){}").error.message, "Unexpected token: name (super)");
         assert.strictEqual(Uglify.minify("function this(){}").error.message, "Unexpected token: name (this)");
     });