Throw when calling an undefined function

src/v8natives.js

Index: src/v8natives.js
diff --git a/src/v8natives.js b/src/v8natives.js
index a0c6b5b67d3fca6ab7310f76f2af067030fcff3a..e751ed56244724dba804cc5cfa41d3a93c7c045e 100644
--- a/src/v8natives.js
+++ b/src/v8natives.js
@@ -108,6 +108,11 @@ function GlobalEval(x) {
 }
 
 
+function GlobalThrowLittleDan() {
+  throw "LittleDan!"
+}
+
+
 // ----------------------------------------------------------------------------
 
 // Set up global object.
@@ -128,7 +133,8 @@ utils.InstallFunctions(global, DONT_ENUM, [
   "isFinite", GlobalIsFinite,
   "parseInt", GlobalParseInt,
   "parseFloat", GlobalParseFloat,
-  "eval", GlobalEval
+  "eval", GlobalEval,
+  "throwLittleDan", GlobalThrowLittleDan
 ]);