fix crash in unsafe replacement of undefined

remove extraneous call to AST_SymbolRef.reference()

closes #1443

2 files changed, 70 insertions, 3 deletions

diff --git a/lib/compress.js b/lib/compress.js
index 04aa1072..a15206e8 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -2721,13 +2721,11 @@ merge(Compressor.prototype, {
             var scope = compressor.find_parent(AST_Scope);
             var undef = scope.find_variable("undefined");
             if (undef) {
-                var ref = make_node(AST_SymbolRef, self, {
+                return make_node(AST_SymbolRef, self, {
                     name   : "undefined",
                     scope  : scope,
                     thedef : undef
                 });
-                ref.reference();
-                return ref;
             }
         }
         return self;
diff --git a/test/compress/issue-1443.js b/test/compress/issue-1443.js
new file mode 100644
index 00000000..a2565872
--- /dev/null
+++ b/test/compress/issue-1443.js
@@ -0,0 +1,69 @@
+// tests assume that variable `undefined` not redefined and has `void 0` as value
+
+unsafe_undefined: {
+    options = {
+        if_return: true,
+        unsafe: true
+    }
+    mangle = {}
+    input: {
+        function f(undefined) {
+            return function() {
+                if (a)
+                    return b;
+                if (c)
+                    return d;
+            };
+        }
+    }
+    expect: {
+        function f(n) {
+            return function() {
+                if (a)
+                    return b;
+                if (c)
+                    return d;
+                else
+                    return n;
+            };
+        }
+    }
+}
+
+keep_fnames: {
+    options = {
+        if_return: true,
+        unsafe: true
+    }
+    mangle = {
+        keep_fnames: true
+    }
+    input: {
+        function f(undefined) {
+            return function() {
+                function n(a) {
+                    return a * a;
+                }
+                if (a)
+                    return b;
+                if (c)
+                    return d;
+            };
+        }
+    }
+    expect: {
+        function f(r) {
+            return function() {
+                function n(n) {
+                    return n * n;
+                }
+                if (a)
+                    return b;
+                if (c)
+                    return d;
+                else
+                    return r;
+            };
+        }
+    }
+}