From 937a6728798cc139defa868c78ddf57d851913d7 Mon Sep 17 00:00:00 2001
From: "Alex Lam S.L" <alexlamsl@gmail.com>
Date: Thu, 28 Jul 2022 20:04:10 +0100
Subject: [PATCH] fix corner case in `mangle` (#5581)

fixes #5580
---
 lib/scope.js           |  7 +++-
 test/compress/const.js | 85 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 91 insertions(+), 1 deletion(-)

diff --git a/lib/scope.js b/lib/scope.js
index 3d19757193d..e3e4248d8e2 100644
--- a/lib/scope.js
+++ b/lib/scope.js
@@ -704,7 +704,12 @@ AST_Toplevel.DEFMETHOD("mangle_names", function(options) {
         }
         redefined.push(def);
         def.references.forEach(reference);
-        if (sym instanceof AST_SymbolCatch || sym instanceof AST_SymbolConst) reference(sym);
+        if (sym instanceof AST_SymbolCatch || sym instanceof AST_SymbolConst) {
+            reference(sym);
+            def.redefined = function() {
+                return redef;
+            };
+        }
         return true;
 
         function reference(sym) {
diff --git a/test/compress/const.js b/test/compress/const.js
index 6964b3daf7e..b39b94742f5 100644
--- a/test/compress/const.js
+++ b/test/compress/const.js
@@ -2011,3 +2011,88 @@ issue_5516: {
     }
     expect_stdout: "function"
 }
+
+issue_5580_1: {
+    mangle = {}
+    input: {
+        "use strict";
+        console.log(function(a, b, c) {
+            try {
+                FAIL;
+            } catch (e) {
+                return function() {
+                    var d = e, i, j;
+                    {
+                        const e = j;
+                    }
+                    return a;
+                }();
+            } finally {
+                const e = 42;
+            }
+        }("PASS"));
+    }
+    expect: {
+        "use strict";
+        console.log(function(r, n, t) {
+            try {
+                FAIL;
+            } catch (o) {
+                return function() {
+                    var n = o, t, c;
+                    {
+                        const o = c;
+                    }
+                    return r;
+                }();
+            } finally {
+                const c = 42;
+            }
+        }("PASS"));
+    }
+    expect_stdout: "PASS"
+    node_version: ">=4"
+}
+
+issue_5580_2: {
+    options = {
+        inline: true,
+        reduce_vars: true,
+        varify: true,
+    }
+    input: {
+        "use strict";
+        (function() {
+            try {
+                throw "PASS";
+            } catch (e) {
+                return function() {
+                    console.log(e);
+                    {
+                        const e = "FAIL 1";
+                    }
+                }();
+            } finally {
+                const e = "FAIL 2";
+            }
+        })();
+    }
+    expect: {
+        "use strict";
+        (function() {
+            try {
+                throw "PASS";
+            } catch (e) {
+                console.log(e);
+                {
+                    const e = "FAIL 1";
+                }
+                return;
+            } finally {
+                var e = "FAIL 2";
+            }
+        })();
+    }
+    expect_stdout: "PASS"
+    node_version: ">=4"
+}