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go/types, types2: alias types are restricted to basic interfaces, should allow arbitrary interfaces #51616

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zigo101 opened this issue Mar 11, 2022 · 3 comments
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go/types, types2: alias types are restricted to basic interfaces, should allow arbitrary interfaces #51616

zigo101 opened this issue Mar 11, 2022 · 3 comments
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FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
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Go1.19

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@zigo101
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zigo101 commented Mar 11, 2022

What version of Go are you using (go version)?

$ go version
go version go1.18rc1 linux/amd64

What did you do?

type C[T any] interface{~int; M() T}
type C1 = C[bool] // error
type C2 = comparable // error
type C3 = interface {~[]byte | ~string} // error

I didn't find this is documented in tip spec.
@gopherbot gopherbot added the Documentation Issues describing a change to documentation. label Mar 11, 2022
@ianlancetaylor ianlancetaylor added the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label Mar 11, 2022
@ianlancetaylor ianlancetaylor added this to the Go1.19 milestone Mar 11, 2022
@ianlancetaylor
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CC @griesemer

@griesemer griesemer self-assigned this Mar 11, 2022
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This is just a bug. I don't see a reason why there should be a restriction here. It's a trivial change but too late for 1.18.

@griesemer griesemer added NeedsFix The path to resolution is known, but the work has not been done. and removed Documentation Issues describing a change to documentation. NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. labels Mar 11, 2022
@griesemer griesemer changed the title spec: the fact that non-basic interfaces are not alias-able is not documented go/types, types2: alias types are restricted to basic interfaces, should allow arbitrary interfaces Mar 11, 2022
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Change https://go.dev/cl/392715 mentions this issue: go/types, types2: alias type declarations may refer to constraint types

@seankhliao seankhliao mentioned this issue Mar 24, 2022
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FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
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