The informal spec for strong mode top level inference
(https://github.com/dart-lang/sdk/pull/28218) says "If there are
multiple overridden/implemented methods, and any two of them have
non-equal types (declared or inferred) for a parameter position which
is being inferred for the overriding method, it is an error."
This CL fixes several SDK errors that arise from this rule. For
example, the classes _Closure, Function, and Object contained members
declared as follows:
class _Closure implements Function {
bool operator ==(other) ...
}
class Function {
bool operator ==(Object other) ...
}
class Object {
bool operator ==(other) ...
}
The type of Object's operator == was (dynamic) -> bool; the type of
Function's operator == was (Object) -> bool; therefore the type of
_Closure's operator == (which overrides both, since _Closure extends
Object and implements Function) cannot be inferred and must be
specified.
A similar situation exists for _Double and _IntegerImplementation
(both implement num, which declares operator == to have type (Object)
-> bool), and _Uri (which implements Uri, which declares operator ==
to have type (Object) -> bool).
This CL fixes the error by specifying the type explicitly in the
classes _Closure, _Double, _IntegerImplementation, and _Uri.
Change-Id: I91f7ceef8549399d438ba4be8c408493b3f338db
Reviewed-on: https://dart-review.googlesource.com/28100
Reviewed-by: Vyacheslav Egorov <vegorov@google.com>
Paul Berry
ba2417fdc0