// such as [Print].
type Stringer interface {
	String() string
}

// GoStringer is implemented by any value that has a GoString method,
// which defines the Go syntax for that value.
// The GoString method is used to print values passed as an operand
// to a %#v format.
type GoStringer interface {
	GoString() string
}

// FormatString returns a string representing the fully qualified formatting

be invoked. In this case the interpretation of verbs and flags is
controlled by that implementation.

3. If the %v verb is used with the # flag (%#v) and the operand
implements the [GoStringer] interface, that will be invoked.

If the format (which is implicitly %v for [Println] etc.) is valid
for a string (%s %q %x %X), or is %v but not %#v,
the following two rules apply: