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cmd/compile: spurious "invalid recursive type" error in anonymous, recursive interfaces #56062

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mdempsky opened this issue Oct 5, 2022 · 1 comment
Closed

cmd/compile: spurious "invalid recursive type" error in anonymous, recursive interfaces #56062

mdempsky opened this issue Oct 5, 2022 · 1 comment
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compiler/runtime Issues related to the Go compiler and/or runtime. NeedsFix The path to resolution is known, but the work has not been done.
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Unplanned

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@mdempsky
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mdempsky commented Oct 5, 2022

cmd/compile crashes on the same test case as #56061:

$ cat q.go
package main

type (
	a interface { m() interface { a; b } }
	b interface { m() interface { a; b } }
)

var _ = new(interface{ a }) == new(interface{ b })

func main() {}

$ go run q.go
# command-line-arguments
./q.go:5:2: internal compiler error: invalid recursive type interface {}
...

/cc @golang/compiler
@mdempsky mdempsky added the NeedsFix The path to resolution is known, but the work has not been done. label Oct 5, 2022
@mdempsky mdempsky added this to the Unplanned milestone Oct 5, 2022
@gopherbot gopherbot added the compiler/runtime Issues related to the Go compiler and/or runtime. label Oct 5, 2022
@mdempsky mdempsky mentioned this issue Oct 8, 2022
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mdempsky commented Sep 6, 2023

Since Go 1.20, cmd/compile rejects this code with "invalid recursive type: anonymous interface refers to itself".

@mdempsky mdempsky closed this as completed Sep 6, 2023
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