Regression test for 'references' bug golang/go#60622:
references to methods of generics were missing.
-- go.mod --
module example.com
go 1.18
-- a/a.go --
package a
type G[T any] struct{}
func (G[T]) M() {} //@loc(Mdef, "M"), refs(Mdef, Mdef, Mref)
-- b/b.go --
package b
import "example.com/a"
func _() {
new(a.G[int]).M() //@loc(Mref, "M")
}