Fix scoping error

Author: jonjaques

lib/index.js

@@ -99,14 +99,16 @@ function hasExtensionError(d){
   return d.messageText.indexOf('must have extension') > -1;
 }
 
-function extensionErrorFilter(d) {
+function extensionErrorFilter(errors) {
   var otherErrors = !errors.every(hasExtensionError);
-  return !(otherErrors && hasExtensionError(d)); 
+  return function(d) {
+    return !(otherErrors && hasExtensionError(d));
+  } 
 }
 
 function formatErrors(errors) {
   return errors
-    .filter(extensionErrorFilter)
+    .filter(extensionErrorFilter(errors))
     .map(function(diagnostic) {
       var lineChar;
       if (diagnostic.file) {