// license that can be found in the LICENSE file.

package cache

import (
	"fmt"
	"os"
	"path/filepath"
	"sync"

	"cmd/go/internal/base"
	"cmd/go/internal/cfg"
	"internal/goexperiment"
)

// Default returns the default cache to use.
// It never returns nil.
func Default() Cache {
	defaultOnce.Do(initDefaultCache)
	return defaultCache
}

var (
	defaultOnce  sync.Once

// Copyright 2020 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:build !goexperiment.staticlockranking

package runtime

const staticLockRanking = false

// // lockRankStruct is embedded in mutex, but is empty when staticklockranking is
// disabled (the default)
type lockRankStruct struct {
}

func lockInit(l *mutex, rank lockRank) {
}

// Copyright 2020 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:build goexperiment.staticlockranking

package sync

import "unsafe"

// Approximation of notifyList in runtime/sema.go. Size and alignment must
// agree.
type notifyList struct {
	wait   uint32
	notify uint32
	rank   int     // rank field of the mutex

// errorcheck -0 -m

//go:build !goexperiment.newinliner

// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Check go:noescape annotations.

package p

// The noescape comment only applies to the next func,
// which must not have a body.

//go:noescape

func F1([]byte)

func F2([]byte)

func G() {

For details see the [language spec](/ref/spec#For_statements).

<!-- go.dev/issue/46477, CL 566856, CL 586955, CL 586956 -->
Go 1.23 includes preview support for [generic type aliases](/issue/46477).

// Copyright 2022 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:build goexperiment.arenas

package reflect

import "arena"

// ArenaNew returns a [Value] representing a pointer to a new zero value for the
// specified type, allocating storage for it in the provided arena. That is,
// the returned Value's Type is [PointerTo](typ).

// asmcheck

//go:build !goexperiment.cgocheck2

// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package codegen

// This file contains code generation tests related to the handling of
// struct types.

// ------------- //
//    Zeroing    //
// ------------- //

type Z1 struct {
	a, b, c int
}

[short] skip

# Hard-wire new coverage for this test.
env GOEXPERIMENT=coverageredesign

# Baseline run.
go test -cover example/foo
stdout 'coverage: 50.0% of statements$'

# Coverage percentage output should mention -coverpkg selection.
go test -coverpkg=example/foo example/foo
stdout 'coverage: 50.0% of statements in example/foo'

# Try to ask for coverage of a package that doesn't exist.
go test -coverpkg nonexistent example/bar

// Copyright 2022 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:build goexperiment.arenas

package main

import "arena"

func main() {
	a := arena.NewArena()
	x := arena.New[[200]byte](a)
	x[0] = 9
	a.Free()
	// Use after free.
	//
	// ASAN should detect this deterministically as Free
	// should poison the arena memory.
	//

// errorcheck -goexperiment rangefunc

// Copyright 2023 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// See ../internal/types/testdata/spec/range.go for most tests.
// The ones in this file cannot be expressed in that framework
// due to conflicts between that framework's error location pickiness
// and gofmt's comment location pickiness.

package p