cmd/compile: error message for missing method on type with another type embedded talks about the embedded type instead

[zigo101]

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

$ go version
go version go1.17 linux/amd64

Does this issue reproduce with the latest release?

Yes

What did you do?

package main

type T0 struct {
	x int
}

func (T0) M0() {}

type T2 struct {
	T0
}

type Q *T2

var q Q

func main() {
	q.M0()
}

What did you expect to see?

q.M0 undefined (type Q has no field or method M0)

What did you see instead?

q.T0.M0 undefined (type T0 has no field or method M0, but does have M0)

[mknyszek]

Is this new in Go 1.17?

CC @griesemer

[cuonglm]

This is fixed at tip 8fff20f

Actually, it was fixed when the compiler switched to use types2. With go1.17, you can do:

$ go1.17 tool compile -G=3 r.go
r.go:18:4: q.M0 undefined (type Q has no field or method M0)

[zigo101]

As this is not qualified for backporting, I will close it.