l.pos -= Pos(w)
		// Correct newline count.
		if r == '\n' {
			l.line--
		}
	}
}

// thisItem returns the item at the current input point with the specified type
// and advances the input.
func (l *lexer) thisItem(t itemType) item {
	i := item{t, l.start, l.input[l.start:l.pos], l.startLine}
	l.start = l.pos
	l.startLine = l.line
	return i
}