From 3b679cd5d2427a0382815ad40459d6f95109aac0 Mon Sep 17 00:00:00 2001
From: alexlamsl <alexlamsl@gmail.com>
Date: Wed, 17 Jan 2018 14:42:54 +0800
Subject: [PATCH] fix `AST_Scope.clone()`

fixes #2799
---
 lib/ast.js                   |  7 +++++++
 lib/utils.js                 |  7 +++++++
 test/compress/reduce_vars.js | 34 ++++++++++++++++++++++++++++++++++
 3 files changed, 48 insertions(+)

diff --git a/lib/ast.js b/lib/ast.js
index 4e41659c..fdd18d69 100644
--- a/lib/ast.js
+++ b/lib/ast.js
@@ -308,6 +308,13 @@ var AST_Scope = DEFNODE("Scope", "variables functions uses_with uses_eval parent
         enclosed: "[SymbolDef*/S] a list of all symbol definitions that are accessed from this scope or any subscopes",
         cname: "[integer/S] current index for mangling variables (used internally by the mangler)",
     },
+    clone: function(deep) {
+        var node = this._clone(deep);
+        node.variables = this.variables.clone();
+        node.functions = this.functions.clone();
+        node.enclosed = this.enclosed.slice();
+        return node;
+    }
 }, AST_Block);
 
 var AST_Toplevel = DEFNODE("Toplevel", "globals", {
diff --git a/lib/utils.js b/lib/utils.js
index dab7f566..9121fa93 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -303,6 +303,13 @@ Dictionary.prototype = {
             ret.push(f(this._values[i], i.substr(1)));
         return ret;
     },
+    clone: function() {
+        var ret = new Dictionary();
+        for (var i in this._values)
+            ret._values[i] = this._values[i];
+        ret._size = this._size;
+        return ret;
+    },
     toObject: function() { return this._values }
 };
 Dictionary.fromObject = function(obj) {
diff --git a/test/compress/reduce_vars.js b/test/compress/reduce_vars.js
index ec0471a8..5f640df8 100644
--- a/test/compress/reduce_vars.js
+++ b/test/compress/reduce_vars.js
@@ -5302,3 +5302,37 @@ issue_2774: {
     }
     expect_stdout: "undefined"
 }
+
+issue_2799: {
+    options = {
+        reduce_funcs: true,
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        console.log(function() {
+            return f;
+            function f(n) {
+                function g(i) {
+                    return i && i + g(i - 1);
+                }
+                function h(j) {
+                    return g(j);
+                }
+                return h(n);
+            }
+        }()(5));
+    }
+    expect: {
+        console.log(function() {
+            return function(n) {
+                return function(j) {
+                    return function g(i) {
+                        return i && i + g(i - 1);
+                    }(j);
+                }(n);
+            }
+        }()(5));
+    }
+    expect_stdout: "15"
+}