fix corner case in `ie8` (#4963)

fixes #4962

2 files changed, 54 insertions, 2 deletions

diff --git a/lib/compress.js b/lib/compress.js
index f683e874..08b0f0d1 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -5281,7 +5281,7 @@ merge(Compressor.prototype, {
                     if (member(def.scope, scopes)) return true;
                     if (scope && !def.redefined()) {
                         var scope_def = scope.find_variable(node.name);
-                        if (def.undeclared ? !scope_def : scope_def === def) {
+                        if (scope_def ? scope_def === def : def.undeclared) {
                             result = "f";
                             return true;
                         }
@@ -7637,7 +7637,6 @@ merge(Compressor.prototype, {
                     }).init_vars(node),
                 }));
                 exprs = [ node ];
-
             }
             if (values) exprs.push(make_node(AST_Call, this, {
                 expression: make_node(AST_Arrow, this, {
diff --git a/test/compress/classes.js b/test/compress/classes.js
index 69d7047e..11dc801f 100644
--- a/test/compress/classes.js
+++ b/test/compress/classes.js
@@ -1590,3 +1590,56 @@ issue_4951_2: {
     expect_stdout: "PASS"
     node_version: ">=14.6"
 }
+
+issue_4962_1: {
+    options = {
+        ie8: true,
+        inline: true,
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        (function() {
+            function f() {
+                while (console.log(typeof g));
+            }
+            class A {
+                static p = f();
+            }
+        })(function g() {});
+    }
+    expect: {
+        (function g() {}),
+        void function() {
+            while (console.log(typeof g));
+        }();
+    }
+    expect_stdout: "undefined"
+    node_version: ">=12"
+}
+
+issue_4962_2: {
+    options = {
+        ie8: true,
+        inline: true,
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        console.log(function f() {}(function g() {
+            function h() {
+                f;
+            }
+            class A {
+                static p = h();
+            }
+        }, typeof g));
+    }
+    expect: {
+        console.log(function f() {}(function g() {
+            f;
+        }));
+    }
+    expect_stdout: "undefined"
+    node_version: ">=12"
+}