cleanFuzzcache bool // clean -fuzzcache flag
	cleanModcache  bool // clean -modcache flag
	cleanTestcache bool // clean -testcache flag
)

func init() {
	// break init cycle
	CmdClean.Run = runClean

	CmdClean.Flag.BoolVar(&cleanI, "i", false, "")
	CmdClean.Flag.BoolVar(&cleanR, "r", false, "")
	CmdClean.Flag.BoolVar(&cleanCache, "cache", false, "")
	CmdClean.Flag.BoolVar(&cleanFuzzcache, "fuzzcache", false, "")

		}
		break
	}
	if errRead == io.EOF {
		return nil, errRead
	}

	// Parse each field in the record.
	var err error
	const quoteLen = len(`"`)
	commaLen := utf8.RuneLen(r.Comma)
	recLine := r.numLine // Starting line for record
	r.recordBuffer = r.recordBuffer[:0]
	r.fieldIndexes = r.fieldIndexes[:0]
	r.fieldPositions = r.fieldPositions[:0]
	pos := position{line: r.numLine, col: 1}

		buf.Reset()
		for i := 0; i < n; i++ {
			buf.WriteByte('x')
		}
	}
}

func BenchmarkWriteRune(b *testing.B) {
	const n = 4 << 10
	const r = '☺'
	b.SetBytes(int64(n * utf8.RuneLen(r)))
	buf := NewBuffer(make([]byte, n*utf8.UTFMax))
	for i := 0; i < b.N; i++ {
		buf.Reset()
		for i := 0; i < n; i++ {
			buf.WriteRune(r)
		}
	}
}

// From Issue 5154.

			continue
		}

		var width int
		if c == utf8.RuneError {
			c, width = utf8.DecodeRuneInString(s[i:])
			if width != 1 && r == c {
				continue
			}
		} else {
			width = utf8.RuneLen(c)
		}

		b.Grow(len(s) + utf8.UTFMax)
		b.WriteString(s[:i])
		if r >= 0 {
			b.WriteRune(r)
		}

		s = s[i+width:]
		break
	}

	// Fast path for unchanged input