Test reflecting on an object that implements Function but has no call method.

tests/lib/mirrors/fake_function_without_call_test.dart

Index: tests/lib/mirrors/fake_function_without_call_test.dart
diff --git a/tests/lib/mirrors/fake_function_without_call_test.dart b/tests/lib/mirrors/fake_function_without_call_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..3bed08181edeb2959566588f6b5cb91ccef92e83
--- /dev/null
+++ b/tests/lib/mirrors/fake_function_without_call_test.dart
@@ -0,0 +1,40 @@
+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import "dart:mirrors";
+
+import "package:expect/expect.dart";
+
+class MultiArityFunction implements Function {
+  noSuchMethod(Invocation msg) {
+    if (msg.memberName != #call) return super.noSuchMethod(msg);
+    return msg.positionalArguments.join(",");
+  }
+}
+
+main() {
+  var f = new MultiArityFunction();
+
+  Expect.isTrue(f is Function);
+  Expect.equals('a', f('a'));
+  Expect.equals('a,b', f('a', 'b'));
+  Expect.equals('a,b,c', f('a', 'b', 'c'));
+  Expect.equals('a', Function.apply(f, ['a']));
+  Expect.equals('a,b', Function.apply(f, ['a', 'b']));
+  Expect.equals('a,b,c', Function.apply(f, ['a', 'b', 'c']));
+  Expect.throws(() => f.foo('a', 'b', 'c'),
+                (e) => e is NoSuchMethodError);
+
+  ClosureMirror cm = reflect(f);
+  Expect.isTrue(cm is ClosureMirror);
+  Expect.equals('a', cm.apply(f, ['a']).reflectee);
+  Expect.equals('a,b', cm.apply(f, ['a', 'b']).reflectee);
+  Expect.equals('a,b,c', cm.apply(f, ['a', 'b', 'c']).reflectee);
+
+  MethodMirror mm = cm.function;
+  Expect.isNull(mm);

[rmacnak, 2013/10/23 18:56:52]

Like cm.type.methods[#call]

+
+  ClassMirror km = cm.type;
+  Expect.equals(reflectClass(MultiArityFunction), km);
+}