This comment was originally written by @seaneagan

Starred!

It should also work in reverse, C1 should be a legitimate implementation of:

interface I { G get f();}

Note as well that getting the Function value works the same with either implementation:

new C1().f;
new C2().f;

I think the way to spec. it is to have methods desugar into Function valued getters, which yields closurization semantics for free, and avoids needing to specify Function getters separately from other getters, which would be strange.

Also see doc linked in issue #1616 (should be merged with this issue or vice versa) for more comments.

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With the type system of Dart 2, we are going in the opposite direction from this.
I can guarantee that this will not happen short of another complete replacement of the type system.