fix corner case in `ie8` & `mangle` (#3476)

fixes #3475

3 files changed, 141 insertions, 9 deletions

diff --git a/lib/scope.js b/lib/scope.js
index 1b570515..bd6cb26a 100644
--- a/lib/scope.js
+++ b/lib/scope.js
@@ -201,7 +201,7 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options) {
         }
         if (node instanceof AST_SymbolLambda) {
             var def = node.thedef;
-            redefine(node, node.scope.parent_scope);
+            redefine(node, node.scope.parent_scope.resolve());
             node.thedef.init = def.init;
             return true;
         }
diff --git a/test/compress/ie8.js b/test/compress/ie8.js
index 9fc2becd..586955d9 100644
--- a/test/compress/ie8.js
+++ b/test/compress/ie8.js
@@ -1189,3 +1189,135 @@ issue_3473_ie8_toplevel: {
     }
     expect_stdout: "100 10 1"
 }
+
+issue_3475: {
+    rename = true
+    mangle = {
+        ie8: false,
+        toplevel: false,
+    }
+    input: {
+        "ooooo ddddd";
+        var a = "FAIL";
+        try {
+            throw 42;
+        } catch (b) {
+            (function f() {
+                a = "PASS";
+            })();
+        }
+        console.log(a);
+    }
+    expect: {
+        "ooooo ddddd";
+        var a = "FAIL";
+        try {
+            throw 42;
+        } catch (o) {
+            (function o() {
+                a = "PASS";
+            })();
+        }
+        console.log(a);
+    }
+    expect_stdout: "PASS"
+}
+
+issue_3475_ie8: {
+    rename = true
+    mangle = {
+        ie8: true,
+        toplevel: false,
+    }
+    input: {
+        "ooooo ddddd";
+        var a = "FAIL";
+        try {
+            throw 42;
+        } catch (b) {
+            (function f() {
+                a = "PASS";
+            })();
+        }
+        console.log(a);
+    }
+    expect: {
+        "ooooo ddddd";
+        var a = "FAIL";
+        try {
+            throw 42;
+        } catch (b) {
+            (function f() {
+                a = "PASS";
+            })();
+        }
+        console.log(a);
+    }
+    expect_stdout: "PASS"
+}
+
+issue_3475_toplevel: {
+    rename = true
+    mangle = {
+        ie8: false,
+        toplevel: true,
+    }
+    input: {
+        "ooooo ddddd";
+        var a = "FAIL";
+        try {
+            throw 42;
+        } catch (b) {
+            (function f() {
+                a = "PASS";
+            })();
+        }
+        console.log(a);
+    }
+    expect: {
+        "ooooo ddddd";
+        var d = "FAIL";
+        try {
+            throw 42;
+        } catch (o) {
+            (function o() {
+                d = "PASS";
+            })();
+        }
+        console.log(d);
+    }
+    expect_stdout: "PASS"
+}
+
+issue_3475_ie8_toplevel: {
+    rename = true
+    mangle = {
+        ie8: true,
+        toplevel: true,
+    }
+    input: {
+        "ooooo ddddd";
+        var a = "FAIL";
+        try {
+            throw 42;
+        } catch (b) {
+            (function f() {
+                a = "PASS";
+            })();
+        }
+        console.log(a);
+    }
+    expect: {
+        "ooooo ddddd";
+        var o = "FAIL";
+        try {
+            throw 42;
+        } catch (d) {
+            (function c() {
+                o = "PASS";
+            })();
+        }
+        console.log(o);
+    }
+    expect_stdout: "PASS"
+}
diff --git a/test/compress/rename.js b/test/compress/rename.js
index eab989b1..08429d7c 100644
--- a/test/compress/rename.js
+++ b/test/compress/rename.js
@@ -579,7 +579,7 @@ function_do_catch_ie8: {
         console.log(b, c);
     }
     expect: {
-        var t = 1, u = 1, y = 0;
+        var u = 1, y = 1, a = 0;
         function c(c) {
             var d;
             do {
@@ -587,7 +587,7 @@ function_do_catch_ie8: {
                     try {
                         var e = void 0;
                     } catch (i) {
-                        --t && w("ddddddddeeeeeeegggggggggiiiiilllllllnnnnntuuuuuuuuyyyyyyy");
+                        --u && w("ddddddddeeeeeeegggggggggiiiiilllllllnnnnntuuuuuuuuyyyyyyy");
                         0;
                         0;
                         0;
@@ -596,18 +596,18 @@ function_do_catch_ie8: {
                         d[1];
                     } catch (l) {
                         var g;
-                        switch(function x() {
-                            y++;
+                        switch (function n() {
+                            a++;
                         }()) {
-                          case e + --g:
+                        case e + --g:
                         }
                     }
-                } catch (n) {}
+                } catch (t) {}
             } while (--d);
-            u--;
+            y--;
         }
         c();
-        console.log(u, y);
+        console.log(y, a);
     }
     expect_stdout: "0 1"
 }