fix corner case in ie8 & rename (#3474)

fixes #3473

lib/scope.js

@@ -192,7 +192,11 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options) {
     // pass 3: fix up any scoping issue with IE8
     if (options.ie8) self.walk(new TreeWalker(function(node) {
         if (node instanceof AST_SymbolCatch) {
-            redefine(node, node.thedef.defun);
+            var scope = node.thedef.defun;
+            if (scope.name instanceof AST_SymbolLambda && scope.name.name == node.name) {
+                scope = scope.parent_scope;
+            }
+            redefine(node, scope);
             return true;
         }
         if (node instanceof AST_SymbolLambda) {

test/compress/collapse_vars.js

@@ -4388,7 +4388,7 @@ replace_all_var: {
 }
 
 replace_all_var_scope: {
-    rename = true;
+    rename = true
     options = {
         collapse_vars: true,
         unused: true,

test/compress/functions.js

@@ -1150,7 +1150,7 @@ issue_2620_3: {
 }
 
 issue_2620_4: {
-    rename = true,
+    rename = true
     options = {
         dead_code: true,
         evaluate: true,

test/compress/ie8.js

@@ -1081,3 +1081,111 @@ issue_3471_ie8: {
     }
     expect_stdout: true
 }
+
+issue_3473: {
+    rename = true
+    mangle = {
+        ie8: false,
+        toplevel: false,
+    }
+    input: {
+        var d = 42, a = 100, b = 10, c = 0;
+        (function b() {
+            try {
+                c++;
+            } catch (b) {}
+        })();
+        console.log(a, b, c);
+    }
+    expect: {
+        var d = 42, a = 100, b = 10, c = 0;
+        (function a() {
+            try {
+                c++;
+            } catch (a) {}
+        })();
+        console.log(a, b, c);
+    }
+    expect_stdout: "100 10 1"
+}
+
+issue_3473_ie8: {
+    rename = true
+    mangle = {
+        ie8: true,
+        toplevel: false,
+    }
+    input: {
+        var d = 42, a = 100, b = 10, c = 0;
+        (function b() {
+            try {
+                c++;
+            } catch (b) {}
+        })();
+        console.log(a, b, c);
+    }
+    expect: {
+        var d = 42, a = 100, b = 10, c = 0;
+        (function b() {
+            try {
+                c++;
+            } catch (b) {}
+        })();
+        console.log(a, b, c);
+    }
+    expect_stdout: "100 10 1"
+}
+
+issue_3473_toplevel: {
+    rename = true
+    mangle = {
+        ie8: false,
+        toplevel: true,
+    }
+    input: {
+        var d = 42, a = 100, b = 10, c = 0;
+        (function b() {
+            try {
+                c++;
+            } catch (b) {}
+        })();
+        console.log(a, b, c);
+    }
+    expect: {
+        var c = 42, o = 100, n = 10, t = 0;
+        (function c() {
+            try {
+                t++;
+            } catch (c) {}
+        })();
+        console.log(o, n, t);
+    }
+    expect_stdout: "100 10 1"
+}
+
+issue_3473_ie8_toplevel: {
+    rename = true
+    mangle = {
+        ie8: true,
+        toplevel: true,
+    }
+    input: {
+        var d = 42, a = 100, b = 10, c = 0;
+        (function b() {
+            try {
+                c++;
+            } catch (b) {}
+        })();
+        console.log(a, b, c);
+    }
+    expect: {
+        var c = 42, o = 100, n = 10, t = 0;
+        (function n() {
+            try {
+                t++;
+            } catch (n) {}
+        })();
+        console.log(o, n, t);
+    }
+    expect_stdout: "100 10 1"
+}

test/exports.js

@@ -8,6 +8,7 @@ exports["parse"] = parse;
 exports["push_uniq"] = push_uniq;
 exports["reserve_quoted_keys"] = reserve_quoted_keys;
 exports["string_template"] = string_template;
+exports["to_ascii"] = to_ascii;
 exports["tokenizer"] = tokenizer;
 exports["TreeTransformer"] = TreeTransformer;
 exports["TreeWalker"] = TreeWalker;

test/mocha/sourcemaps.js

@@ -1,7 +1,7 @@
 var assert = require("assert");
 var readFileSync = require("fs").readFileSync;
 var SourceMapConsumer = require("source-map").SourceMapConsumer;
-var UglifyJS = require("../..");
+var UglifyJS = require("../node");
 
 function read(path) {
     return readFileSync(path, "utf8");
@@ -244,7 +244,7 @@ describe("sourcemaps", function() {
             assert.strictEqual(map.sourcesContent.length, 1);
             assert.strictEqual(map.sourcesContent[0], code);
             var encoded = result.code.slice(result.code.lastIndexOf(",") + 1);
-            map = JSON.parse(new Buffer(encoded, "base64").toString());
+            map = JSON.parse(UglifyJS.to_ascii(encoded));
             assert.strictEqual(map.sourcesContent.length, 1);
             assert.strictEqual(map.sourcesContent[0], code);
             result = UglifyJS.minify(result.code, {