if !(isName(selx.X, "check") && isName(selx.Sel, "errorf")) {
				return true
			}
			// check.errorf calls should have at least errorfMinArgCount arguments:
			// position, code, format string, and arguments to format
			if n := len(call.ArgList); n < errorfMinArgCount {
				t.Errorf("%s: got %d arguments, want at least %d", call.Pos(), n, errorfMinArgCount)
				return false
			}
			format := call.ArgList[errorfFormatIndex]

	byter, ok := r.(io.ByteReader)
	if !ok {
		byter = bufio.NewReader(r)
	}
	return bitReader{r: byter}
}

// ReadBits64 reads the given number of bits and returns them in the
// least-significant part of a uint64. In the event of an error, it returns 0
// and the error can be obtained by calling bitReader.Err().
func (br *bitReader) ReadBits64(bits uint) (n uint64) {
	for bits > br.bits {

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// All of the actual test files have limited build constraints. This file
// ensures there's at least one test file on every platform.

	}

	// Expect at least one clump of at least 3.
	n3 := 0
	got := []int{}
	for _, v := range varsAtFrameOffset {
		if v > 2 {
			n3++
		}
		got = append(got, v)
	}
	sort.Ints(got)
	if n3 == 0 {
		t.Logf("%s\n", string(out))
		t.Fatalf("expected at least one clump of 3, got: %+v", got)
	}

# Flags specified with -gcflags should appear after other flags generated by cmd/go.

cd m
go build -n -gcflags=-lang=go1.17
stderr ' -lang=go1.16.* -lang=go1.17'
! go build -gcflags='-c 0'
stderr 'compile: -c must be at least 1, got 0'

-- m/go.mod --
module example.com

go 1.16

-- m/main.go --
package main

func main() {
    var s = []int{1, 2, 3}
    var pa = (*[2]int)(s[1:])
    println(pa[1])

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Package compact defines a compact representation of language tags.
//
// Common language tags (at least all for which locale information is defined
// in CLDR) are assigned a unique index. Each Tag is associated with such an
// ID for selecting language-related resources (such as translations) as well

stdout tidy

# go help mod tidy explains tidy
go help mod tidy
stdout 'usage: go mod tidy'

# go mod help tidy does too
go mod help tidy
stdout 'usage: go mod tidy'

# go mod --help doesn't print help but at least suggests it.
! go mod --help
stderr 'Run ''go help mod'' for usage.'

# Earlier versions of Go printed the same as 'go -h' here.
# Also make sure we print the short help line.
! go vet -h
stderr 'usage: go vet .*'

# Tests for the telemetry subcommand,

# The script test framework sets TEST_TELEMETRY_DIR (overriding the
# default telemetry dir location) and then checks that at least one
# counter has been written per script tests.
# Run go before unsetting TEST_TELEMETRY_DIR to make the tests happy.
# We want to unset it so the environment we're testing is as close
# to a user's environment.
go help telemetry
env TEST_TELEMETRY_DIR=

	s.col -= uint(s.r - s.b)
	s.r = s.b
	s.nextch()
}

func (s *source) nextch() {
redo:
	s.col += uint(s.chw)
	if s.ch == '\n' {
		s.line++
		s.col = 0
	}

	// fast common case: at least one ASCII character
	if s.ch = rune(s.buf[s.r]); s.ch < sentinel {
		s.r++
		s.chw = 1
		if s.ch == 0 {
			s.error("invalid NUL character")
			goto redo
		}
		return
	}

// Implements methods to filter samples from profiles.

import "regexp"

// FilterSamplesByName filters the samples in a profile and only keeps
// samples where at least one frame matches focus but none match ignore.
// Returns true is the corresponding regexp matched at least one sample.
func (p *Profile) FilterSamplesByName(focus, ignore, hide, show *regexp.Regexp) (fm, im, hm, hnm bool) {
	if focus == nil && ignore == nil && hide == nil && show == nil {