Scanner.scanDirectiveNameToSlice
void scanDirectiveNameToSlice(ref char[] slice, const Mark startMark) @safeScan name of a directive token.
Assumes that the caller is building a slice in Reader, and puts the scanned characters into that slice.
void scanDirectiveNameToSlice(ref char[] slice, const Mark startMark) @safeScan name of a directive token.
Assumes that the caller is building a slice in Reader, and puts the scanned characters into that slice.