env TESTKEY=x
go test testcache -run=TestLookupEnv
go test testcache -run=TestLookupEnv
stdout '\(cached\)'

# GODEBUG is always read
env GODEBUG=asdf=1
go test testcache -run=TestLookupEnv
! stdout '\(cached\)'
go test testcache -run=TestLookupEnv
stdout '\(cached\)'
env GODEBUG=

env TESTKEY=y
go test testcache -run=TestLookupEnv
! stdout '\(cached\)'
go test testcache -run=TestLookupEnv

# input in any reasonable amount of time.

[short] skip
[!fuzz-instrumented] skip
env GOCACHE=$WORK/cache

# TODO(#51484): enabled debugging info to help diagnose a deadlock in the fuzzer
env GODEBUG=fuzzdebug=1
! go test -fuzz=FuzzCov -v
! stderr 'cov instrumentation working'

-- go.mod --
module test

-- cov_test.go --
package cov

import "testing"

func FuzzCov(f *testing.F) {

//
// The enabled parameter determines whether the resulting [TypeName]'s
// type is an [types.Alias]. Its value must be the result of a call to
// [Enabled], which computes the effective value of
// GODEBUG=gotypesalias=... by invoking the type checker. The Enabled
// function is expensive and should be called once per task (e.g.
// package import), not once per call to NewAlias.

[short] skip

env GO111MODULE=on
env GOCACHE=$WORK/gocache
env GODEBUG=gocachetest=1

# The first run of a test should not be cached.
# The second run should be.
go test -run=WriteTmp .
! stdout '(cached)'
go test -run=WriteTmp .
stdout '(cached)'

# 'go test' without arguments should never be cached.
go test -run=WriteTmp
! stdout '(cached)'
go test -run=WriteTmp
! stdout '(cached)'

package time

import (
	"internal/godebug"
	"unsafe"
)

// Sleep pauses the current goroutine for at least the duration d.
// A negative or zero duration causes Sleep to return immediately.
func Sleep(d Duration)

var asynctimerchan = godebug.New("asynctimerchan")

// syncTimer returns c as an unsafe.Pointer, for passing to newTimer.
// If the GODEBUG asynctimerchan has disabled the async timer chan

	// Add "." to PATH so that exec.LookPath looks in the current directory on all systems.
	// And try to trick it with "../testdir" too.
	for _, errdot := range []string{"1", "0"} {
		t.Run("GODEBUG=execerrdot="+errdot, func(t *testing.T) {
			t.Setenv("GODEBUG", "execerrdot="+errdot+",execwait=2")
			for _, dir := range []string{".", "../testdir"} {
				t.Run(pathVar+"="+dir, func(t *testing.T) {

			t.Errorf("Get2(%x) = %x, %d, want %x, %d", id, entry.OutputID, entry.Size, dummyID(i*99), int64(i)*101)
		}
	}
}

func TestVerifyPanic(t *testing.T) {
	os.Setenv("GODEBUG", "gocacheverify=1")
	initEnv()
	defer func() {
		os.Unsetenv("GODEBUG")
		verify = false
	}()

	if !verify {
		t.Fatal("initEnv did not set verify")
	}

	dir, err := os.MkdirTemp("", "cachetest-")
	if err != nil {

package counter

import (
	"fmt"
	"os"
	"runtime"
	"strings"
	"sync/atomic"
)

// Note: not using internal/godebug, so that internal/godebug can use internal/counter.
var debugCounter = strings.Contains(os.Getenv("GODEBUG"), "countertrace=1")

func debugPrintf(format string, args ...interface{}) {
	if debugCounter {
		if len(format) == 0 || format[len(format)-1] != '\n' {

env GO111MODULE=off
env GODEBUG=gocachetest=1

[!compiler:gc] skip
[short] skip # clears cache, rebuilds too much

# Set up fresh GOCACHE.
env GOCACHE=$WORK/gocache
mkdir $GOCACHE

# Building a trivial non-main package should run compiler the first time.
go build -x -gcflags=-m lib.go
stderr 'compile( |\.exe"?)'
stderr 'lib.go:2.* can inline f'

# ... but not the second, even though it still prints the compiler output.

	// to the outside world.
	Arenas bool

	// CgoCheck2 enables an expensive cgo rule checker.
	// When this experiment is enabled, cgo rule checks occur regardless
	// of the GODEBUG=cgocheck setting provided at runtime.
	CgoCheck2 bool

	// LoopVar changes loop semantics so that each iteration gets its own
	// copy of the iteration variable.
	LoopVar bool