}

	var fact isWrapper
	if pass.ImportObjectFact(fn, &fact) {
		return fn, fact.Kind
	}

	return fn, KindNone
}

// isFormatter reports whether t could satisfy fmt.Formatter.
// The only interface method to look for is "Format(State, rune)".
func isFormatter(typ types.Type) bool {
	// If the type is an interface, the value it holds might satisfy fmt.Formatter.
	if _, ok := typ.Underlying().(*types.Interface); ok {

	// %w accepts only errors.
	if m.t == argError {
		return types.ConvertibleTo(typ, errorType)
	}

	// If the type implements fmt.Formatter, we have nothing to check.
	if isFormatter(typ) {
		return true
	}

	// If we can use a string, might arg (dynamically) implement the Stringer or Error interface?
	if m.t&argString != 0 && isConvertibleToString(typ) {
		return true
	}