From db1e4ee5bf98196466f732da9a909535eef54643 Mon Sep 17 00:00:00 2001
From: Nathan Rajlich <nathan@tootallnate.net>
Date: Tue, 25 Oct 2011 23:56:07 -0700
Subject: [PATCH 1/2] More bulletproof `util.inspect()` function.

Use the *real* versions of the Date and RegExp functions, from the
prototype. This defends against code like:

  var d = new Date()
  d.toUTCString = null
  util.inspect(d)
    // TypeError: toUTCString is not a function
---
 lib/util.js | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/lib/util.js b/lib/util.js
index 07e2e3ba9903..7fd432a4af8b 100644
--- a/lib/util.js
+++ b/lib/util.js
@@ -180,10 +180,10 @@ function formatValue(ctx, value, recurseTimes) {
       return ctx.stylize('[Function' + name + ']', 'special');
     }
     if (isRegExp(value)) {
-      return ctx.stylize('' + value, 'regexp');
+      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
     }
     if (isDate(value)) {
-      return ctx.stylize(value.toUTCString(), 'date');
+      return ctx.stylize(Date.prototype.toUTCString.call(value), 'date');
     }
     if (isError(value)) {
       return formatError(value);
@@ -206,12 +206,12 @@ function formatValue(ctx, value, recurseTimes) {
 
   // Make RegExps say that they are RegExps
   if (isRegExp(value)) {
-    base = ' ' + value;
+    base = ' ' + RegExp.prototype.toString.call(value);
   }
 
   // Make dates with properties first say the date
   if (isDate(value)) {
-    base = ' ' + value.toUTCString();
+    base = ' ' + Date.prototype.toUTCString.call(value);
   }
 
   // Make error with message first say the error
@@ -225,7 +225,7 @@ function formatValue(ctx, value, recurseTimes) {
 
   if (recurseTimes < 0) {
     if (isRegExp(value)) {
-      return ctx.stylize('' + value, 'regexp');
+      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
     } else {
       return ctx.stylize('[Object]', 'special');
     }

From 5c0a7453c70631e82169bc7ae020bb9b6724899c Mon Sep 17 00:00:00 2001
From: Nathan Rajlich <nathan@tootallnate.net>
Date: Wed, 26 Oct 2011 12:45:51 -0700
Subject: [PATCH 2/2] Add test cases for #1944.

---
 test/simple/test-util-inspect.js | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/test/simple/test-util-inspect.js b/test/simple/test-util-inspect.js
index 8c98ed21c05d..a2912f762c13 100644
--- a/test/simple/test-util-inspect.js
+++ b/test/simple/test-util-inspect.js
@@ -62,3 +62,16 @@ assert.ok(ex.indexOf('[type]') != -1);
 // GH-1941
 // should not throw:
 assert.equal(util.inspect(Object.create(Date.prototype)), '{}')
+
+// GH-1944
+assert.doesNotThrow(function () {
+  var d = new Date();
+  d.toUTCString = null;
+  util.inspect(d);
+});
+
+assert.doesNotThrow(function () {
+  var r = /regexp/;
+  r.toString = null;
+  util.inspect(r);
+});