Change IllegalArgumentException to ArgumentError.

lib/core/errors.dart

Index: lib/core/errors.dart
diff --git a/lib/core/errors.dart b/lib/core/errors.dart
index 659810714f30d829a97fc67b27794ca590067029..ee50f8a6aed714cb34724612d65d4a2dfe0d310d 100644
--- a/lib/core/errors.dart
+++ b/lib/core/errors.dart
@@ -16,6 +16,28 @@ class TypeError implements AssertionError {
 class CastException implements Error {
 }
 
+/**
+ * Error thrown when a function is passed an unacceptable argument.
+ */
+class ArgumentError implements Error {
+  final message;
+
+  /** The [message] describes the erroneous argument. */
+  const ArgumentError([this.message = ""]);
+
+  String toString() => "Illegal argument(s): $message";

[Søren Gjesse, 2012/09/25 12:22:24]

Shouldn't the toString result be without the ": " at the end if message is null
or the empty string?

[Lasse Reichstein Nielsen, 2012/09/25 12:28:07]

It should, yes.

+}
+
+/**
+ * Temporary backwards compatibility class.
+ *
+ * Removed when users have had time to change to using [ArgumentError].
+ */
+class IllegalArgumentException extends ArgumentError {
+  const IllegalArgumentException([argument = ""]) : super(argument);
+}
+
+
 class FallThroughError implements Error {
   const FallThroughError();
 }