I think addressing this would sensibly include a rule to allow unifying two
types, if one is assignable to the other (which, AIUI, we already do for
directional channels).
It's possible that this can be confusing in some circumstances including
composite types e.g. something like
func Append[T any](s []T, v ...T)
func main() {
var (
s []any
v []io.Reader
)
s = Append(s, v...) // would infer Append[any] and then fail to compile
because []io.Reader is not assignable to []any
}
But I can't really come up with an example where this is worse than the
status quo. Or even where something that *could* compile with fully
specified instantiation then doesn't compile with inferred arguments.
The situation also becomes significantly more complex if we take assignment
context into account for inference. AIUI we currently don't and it is
something I want.
I wouldn't want to confidently state that this is something we should or
should not do.
On Tue, Oct 24, 2023 at 5:01 PM tapi...@gmail.com <tapir....@gmail.com>
wrote:
> My another surprise is that the below partial instantiation doesn't work.
>
> s = slices.Insert[[]Suiter](s, len(s), Clubs{}) // not work
> s = slices.Insert[[]Suiter, Suiter](s, len(s), Clubs{}) // works
>
> On Monday, October 23, 2023 at 11:01:47 AM UTC+8 tapi...@gmail.com wrote:
>
>> On Monday, October 23, 2023 at 10:38:59 AM UTC+8 tapi...@gmail.com wrote:
>>
>> Sorry, I didn't look your full code.
>> I think the full code should work with Go toolchain 1.21.n.
>>
>>
>> Aha, it actually doesn't. I'm surprised.
>>
>>
>> On Sunday, October 22, 2023 at 4:40:55 PM UTC+8 Mike Schinkel wrote:
>>
>> How so?
>>
>> Can you give an example scenario where it could cause unintended
>> consequences? Or some other negative?
>>
>> -Mike
>>
>> On Saturday, October 21, 2023 at 11:57:52 PM UTC-4 tapi...@gmail.com
>> wrote:
>>
>>
>> It is hard to call such type inference better. That is too aggressive.
>>
>> --
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