Implicit closure for method doesn't handle named parameters

[munificent]

This works:
  foo(arg, [optional]) => print(arg); // <- Function, not method.
  invoke(callback, arg) => callback(arg);
  main() => invoke(foo, 'function');

So does this:
  invoke(callback, arg) => callback(arg);
  class Bar {
    foo(arg) => print(arg); // <- No optional param.
    bar() => invoke(foo, 'method');
  }

  main() => new Bar().bar();

But this does not:
  invoke(callback, arg) => callback(arg);
  class Bar {
    foo(arg, [optional]) => print(arg);
    bar() => invoke(foo, 'method');
  }

  main() => new Bar().bar();

It raises:

  node.js:134
          throw e; // process.nextTick error, or 'error' event on first tick
          ^
  ReferenceError: ClosureArgumentMismatchException is not defined

[jmesserly]

This is pretty much the same underlying issue as this:
http://code.google.com/p/dart/issues/detail?id=282

Runtime optional param info is only being attached to methods. Lambdas, implicit closures, and natives don't get it.

---

Marked this as being blocked by #282.

[rakudrama]

Implicit binders would have it if it was possible to look into the result of Function.prototype.bind

I suggest replacing the binding-getter calls like
  Bar.prototype.foo$getter = function () {
    return this.foo.bind(this);
  }
with
  Bar.prototype.foo$getter = function () {
    return $bind$N(this.foo, this);
  }
or
  Bar.prototype.foo$getter = function () {
    return $bind$N$optional(this.foo, this);
  }

where N is the natural arity, and the ...$optional variants copy the $optional from the function to the result of binding.

[sigmundch]

Fixed in r6850. 282 still needs fixing.

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Added Fixed label.
Unmarked this as being blocked by #-282.