Change signature of noSuchMethod to take an InvocationMirror.

lib/core/errors.dart

Index: lib/core/errors.dart
diff --git a/lib/core/errors.dart b/lib/core/errors.dart
index 9a16d83d2d2bd23964cd7fb7b1480f2619e0f74b..06e5eec0853036b06f79b2c86f388e40e68b55a4 100644
--- a/lib/core/errors.dart
+++ b/lib/core/errors.dart
@@ -75,6 +75,7 @@ class NoSuchMethodError implements Error {
   final Object _receiver;
   final String _functionName;
   final List _arguments;
+  final Map<String, dynamic> _namedArguments;

[regis, 2012/10/26 23:27:08]

Why not an InvocationMirror, instead of _functionName, _arguments, and
_namedArguments?

[Lasse Reichstein Nielsen, 2012/10/27 21:52:45]

Two reasons.
The first is that you might want to optimize away calls to Object.noSuchMethod
and just throw a NoSuchMethodError directly, without ever creating an
InvocationMirror.
I just didn't see a reason to make a dependency between the two classes when it
could be avoided.
Second, we need to throw NoSuchMethodError on static calls as well, where there
is no need for an InvocationMirror at all.
And third: plain paranoid defensive programming - I don't want the invokeOn
function to get around unnecessarily.

   final List _existingArgumentNames;
 
   /**
@@ -93,16 +94,31 @@ class NoSuchMethodError implements Error {
   const NoSuchMethodError(Object this._receiver,
                           String this._functionName,
                           List this._arguments,
+                          this._namedArguments,

[regis, 2012/10/26 23:27:08]

We could pass the receiver and invocation mirror instead of separate fields.

                           [List existingArgumentNames = null])
       : this._existingArgumentNames = existingArgumentNames;
 
   String toString() {
     StringBuffer sb = new StringBuffer();
-    for (int i = 0; i < _arguments.length; i++) {
-      if (i > 0) {
-        sb.add(", ");
+    int i = 0;
+    if (_arguments != null) {
+      for (; i < _arguments.length; i++) {
+        if (i > 0) {
+          sb.add(", ");
+        }
+        sb.add(safeToString(_arguments[i]));
       }
-      sb.add(safeToString(_arguments[i]));
+    }
+    if (_namedArguments != null) {
+      _namedArguments.forEach((String key, var value) {
+        if (i > 0) {
+          sb.add(", ");
+        }
+        sb.add(key);
+        sb.add(": ");
+        sb.add(safeToString(value));
+        i++;
+      });
     }
     if (_existingArgumentNames === null) {
       return "NoSuchMethodError : method not found: '$_functionName'\n"