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

$ go version
go version go1.18.3 linux/amd64

Does this issue reproduce with the latest release?

yes

What operating system and processor architecture are you using (go env)?

$ go env
GOARCH="amd64"
GOOS="linux"

What did you do?

package main

import "fmt"

type Foo struct{}
type Bar struct{}
type Both struct {
	Foo
	Bar
}

func (f Foo) Get() Foo   { return f }
func (b Bar) Get() Bar   { return b }
func (b Both) Get() Both { return b }

type Getter[T any] interface {
	Get() T
}

func Get[T Getter[T]](v T) T {
	r := v.Get()
	fmt.Println(r)
	return r
}

func main() {
	fmt.Println(Get(Both{}))
}

https://go.dev/play/p/0gpMl406d1K

What did you expect to see?

./prog.go:21:_: ambiguous selector v.Get

What did you see instead?

./prog.go:23:2: ambiguous selector v.Get

Line 23 is the return statement. Line 21 is the Get.

It would also be useful if the message indicated which type was ambiguous (in this case, it's the Both type).

Note there should be no error at all. But that is filed as issue #53419