// digitsOrMinus consumes either a sequence of digits or the single
// char '-' followed by a space.
func digitsOrMinus(l *lexrec.Lexer, t lexrec.ItemType, emit bool) (success bool) {
if l.AcceptRun(digits) || (l.Accept("-") && l.Peek() == ' ') {
if emit {
l.Emit(t)
} else {
l.Skip()
}
return true
}
l.Errorf("expected a '-' or a sequence of %q, got %q", digits, l.Peek())
return false
}
