method closures need binding

[jmesserly]

given obj.method in Dart, I suspect DDC currently generates obj.method in JS. That won't work. Static codegen should be obj.method.bind(obj) and dynamic gets will need to handle this as well. Perhaps a helper so we don't have to repeat obj: dart.bind(obj, 'method')

[jmesserly]

another option is a closure wrap like solution: (...args) => obj.method(...args)

regardless I think we need to support == operator on these: Iff identical(o1, o2) then o1.m == o2.m. from "16.18.1 Closurization" in dart language spec 2

[jmesserly]

similar TODO that I just noticed:

Getter returning a function with a call method, we don't generate the .call correctly.

[jmesserly]

also, we may wish to preserve the fact that it was a "dart object", which would lean to the dart.bind approach

[jmesserly]

closing for now, but we'll need to revisit identity issues (those should be covered by language tests)

[jmesserly]

implementation was 4138cbc