pkg go/types, method (Checker) TypeOf(ast.Expr) Type
pkg go/types, method (Error) Error() string
pkg go/types, method (TypeAndValue) Addressable() bool
pkg go/types, method (TypeAndValue) Assignable() bool
pkg go/types, method (TypeAndValue) HasOk() bool
pkg go/types, method (TypeAndValue) IsBuiltin() bool
pkg go/types, method (TypeAndValue) IsNil() bool
pkg go/types, method (TypeAndValue) IsType() bool

   */
  public static <V extends @Nullable Object> ListenableFuture<V> immediateFuture(
      @ParametricNullness V value) {
    if (value == null) {
      // This cast is safe because null is assignable to V for all V (i.e. it is bivariant)
      @SuppressWarnings("unchecked")
      ListenableFuture<V> typedNull = (ListenableFuture<V>) ImmediateFuture.NULL;
      return typedNull;
    }

		} else {
			reflectV := reflect.ValueOf(v)
			// Optimal value type acquisition for v
			reflectValType := reflectV.Type()

			if reflectValType.AssignableTo(field.FieldType) {
				if reflectV.Kind() == reflect.Ptr && reflectV.Elem().Kind() == reflect.Ptr {
					reflectV = reflect.Indirect(reflectV)
				}
				field.ReflectValueOf(ctx, value).Set(reflectV)
				return

				reflect.Copy(fieldValue, oldFieldValue)
			}

			appendToFieldValues := func(ev reflect.Value) {
				if ev.Type().AssignableTo(elemType) {
					fieldValue = reflect.Append(fieldValue, ev)
				} else if ev.Type().Elem().AssignableTo(elemType) {
					fieldValue = reflect.Append(fieldValue, ev.Elem())
				} else {

pkg reflect, type StructField struct, Tag StructTag
pkg reflect, type StructField struct, Type Type
pkg reflect, type StructTag string
pkg reflect, type Type interface, Align() int
pkg reflect, type Type interface, AssignableTo(Type) bool
pkg reflect, type Type interface, Bits() int
pkg reflect, type Type interface, ChanDir() ChanDir
pkg reflect, type Type interface, Elem() Type
pkg reflect, type Type interface, Field(int) StructField