cl: processPkg check runtimeTypes for generic method

cl/_testrt/tpmethod/in.go

@@ -0,0 +1,37 @@
+package main
+
+type Tuple[T any] struct {
+	v T
+}
+
+func (t Tuple[T]) Get() T {
+	return t.v
+}
+
+type Future[T any] interface {
+	Then(func(T))
+}
+
+type future[T any] struct {
+	fn func(func(T))
+}
+
+func (f *future[T]) Then(callback func(T)) {
+	f.fn(callback)
+}
+
+func Async[T any](fn func(func(T))) Future[T] {
+	return &future[T]{fn: fn}
+}
+
+func ReadFile(fileName string) Future[Tuple[error]] {
+	return Async[Tuple[error]](func(resolve func(Tuple[error])) {
+		resolve(Tuple[error]{v: nil})
+	})
+}
+
+func main() {
+	ReadFile("foo.txt").Then(func(v Tuple[error]) {
+		println(v.Get())
+	})
+}