cmd/go: Generate type has no method on type redefine

[RelicOfTesla]

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

$ go version
go version go1.18.3 windows/amd64

Does this issue reproduce with the latest release?

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

go env Output

$ go env

What did you do?

type TestT[T any] struct {
	V T
}

func (TestT[T]) Hello1() {
	fmt.Println("hello")
}

type TestInt1 TestT[int]
type TestInt2 TestT[int]
type TestInt3 = TestT[int]

func TestGoType(t *testing.T) {
	var (
		v1 TestInt1
		v2 TestInt2
		v3 TestInt3
		v4 TestT[int]
	)
	v1.Hello1() // v1.Hello1 undefined (type TestInt1 has no field or method Hello1)
	v2.Hello1() // v2.Hello1 undefined (type TestInt2 has no field or method Hello1)
	v3.Hello1()
	v4.Hello1()
	v3 = v4
	//v1 != v2
}

What did you expect to see?

Support call method.

What did you see instead?

undefined (type TestInt1 has no field or method Hello1)

[seankhliao]

Like all type declarations, methods are cleared out.

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