On Friday, November 12, 2021 at 5:33:19 PM UTC+8 axel.wa...@googlemail.com
wrote:
> I suspect this issue is hard/impossible to avoid, because it must be
> possible to self- and mutually reference type-parameters, in a way that
> it's not for normal parameters, to allow to write something like
>
> type Equaler[T any] interface {
> Equal(T) bool
> }
> func Eq[T Equaler[T]](a, b T) bool {
> return a.Equal(b)
> }
>
I don't see the same problem here. "T" and "Equaler" are two different
identifiers.
>
> or basically any use-case for constraint-type inference.
>
> Even if we *could* allow it consistently, the rules for doing that would
> likely be pretty complex. Better to take the relatively minor hit of
> disallowing this overloading (you can always use different names for the
> type-parameters, if they conflict with the constraint you want to use) than
> to take the hit of complex scoping rules with lots of exceptions.
>
> On Fri, Nov 12, 2021 at 9:48 AM tapi...@gmail.com <tapi...@gmail.com>
> wrote:
>
>> I expect the following code compilers okay, but it doesn't.
>> It looks All the three "I" in the Bar function declaration are
>> viewed as the type parameter, whereas the second one is
>> expected as the constraint I (at least by me).
>>
>> package main
>>
>> type I interface { M() }
>>
>> func Foo(i I) {
>> i.M()
>> }
>>
>> func Bar[I I](i I) { // cannot use a type parameter as constraint
>> i.M()
>> }
>>
>> func main() {}
>>
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>> .
>>
>
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