Suffix() not implemented

I am getting this error, I may be wrong but it looks like the prefix and suffix functions may not be public in String_Extensions in the base library. If I am right can this be fixed?

//
// Subscripts
//
func prefix(through: Index) -> NativeString {
return self[…through] // E119 Cannot use the unary operator “…” on type “extension String.Index”
}

func prefix(upTo: Index) -> NativeString {
return self[…<upTo] // E119 Cannot use the unary operator “…<” on type “extension String.Index”
}

func suffix(from: Index) -> NativeString {
return self[from…]
}

yup, missing the public keyword. I’ll fix.