type fmt.Formatter

4 uses

	fmt (current package)
		print.go#L53: type Formatter interface {
		print.go#L590: 	if formatter, ok := p.arg.(Formatter); ok {

	math/big
		ftoa.go#L454: var _ fmt.Formatter = &floatZero // *Float must implement fmt.Formatter
		intconv.go#L53: var _ fmt.Formatter = intOne // *Int must implement fmt.Formatter