In the following program, it is valid to pass an interface to function P:
func P[T fmt.Stringer](x T) {
fmt.Println(x)
}
func main() {
var v fmt.Stringer
P(v)
}
However, there is no way for P to check if x is nil. This does not compile:
func P[T fmt.Stringer](x T) {
if x!=nil {
fmt.Println(x)
}
}
Is it possible to write a generic function that can test if its
argument with a constraint is nil?
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