Forward reference causes function type mismatch error

[jclark]

With slalpha4, this:

import ballerina/io;

class MyIterable {
    *object:Iterable;

    public function iterator() returns MyIterator {
        return new;
    }

}

public class MyIterator {
    public function next() returns record {| int value; |}? {
        return ();
    }
}


public function main() {
   foreach var i in new MyIterable() {
     io:println(i);
   }
}

gets a mismatched function signatures compile error. The error goes away if I move the declaration of MyIterator to before MyIterable.