affected/package: internal compiler error: assertion failed

[CarstenLeue]

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

$ go version
go version go1.18.4 windows/amd64

Does this issue reproduce with the latest release?

yes

What did you do?

compile a small go file

package weird

type Weird[A any] interface {
}

type weird struct {
}

func MakeWeird[A any]() Weird[A] {
	return weird{}
}

func IsWeird[A any](data Weird[A]) bool {
	switch data.(type) {
	case weird:
		return true
	default:
		return false
	}
}

What did you expect to see?

successful compile

What did you see instead?

.\weird\weird.go:10:14: internal compiler error: assertion failed

[seankhliao]

Doesn't repro on tip

[seankhliao]

Duplicate of #53762