// Copyright 2024 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 runtime

import _ "unsafe"

// These should be an internal details
// but widely used packages access them using linkname.
// Do not remove or change the type signature.
// See go.dev/issue/67401.

// Notable members of the hall of shame include:

// Copyright 2024 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 main

// typedef struct { int a; void* ptr; } S;
// static void f(S* p) {}
import "C"

func main() {
	C.f(&C.S{
		a: 1+

			(3 + ""), // ERROR HERE

		ptr: nil,
	})

// Copyright 2024 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 dragonfly || freebsd

package unix

import "syscall"

// References:
// - https://man.freebsd.org/cgi/man.cgi?open(2)
// - https://man.dragonflybsd.org/?command=open&section=2

// errorcheck

// 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.

// Verify error messages for incorrect if/switch headers.

package p

func f() {
	if f() true { // ERROR "unexpected name true, expected {"
	}

	switch f() true { // ERROR "unexpected name true, expected {"
	}

// 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.

package event

// SchedReqs is a set of constraints on what the scheduling
// context must look like.
type SchedReqs struct {
	Thread    Constraint
	Proc      Constraint
	Goroutine Constraint
}

// Constraint represents a various presence requirements.
type Constraint uint8

// Copyright 2016 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 os

import (
	"errors"
	_ "unsafe" // for linkname
)

//go:linkname executablePath
var executablePath string // set by ../runtime/os_darwin.go

var initCwd, initCwdErr = Getwd()

func executable() (string, error) {
	ep := executablePath
	if len(ep) == 0 {

// errorcheck

// Copyright 2017 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.

// Make sure this doesn't crash the compiler.
// (This test should be part of the internal/syntax
// package, but we don't have a general test framework
// there yet, so put it here for now. See also #20800.)

package e

// Copyright 2024 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 darwin || dragonfly || freebsd || netbsd || openbsd

package syscall

import _ "unsafe"

// used by internal/syscall/unix
//go:linkname ioctlPtr

// golang.org/x/net linknames sysctl.
// Do not remove or change the type signature.
//

// Copyright 2024 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 syscall

import _ "unsafe"

// used by os
//go:linkname closedir
//go:linkname readdir_r

// used by internal/poll
//go:linkname fdopendir

// used by internal/syscall/unix
//go:linkname unlinkat
//go:linkname openat
//go:linkname fstatat

// Copyright 2024 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.

// Use of public API is ok.

package main

import (
	"iter"
	"unique"
)

func seq(yield func(int) bool) {
	yield(123)
}

var s = "hello"

func main() {
	h := unique.Make(s)
	next, stop := iter.Pull(seq)
	defer stop()
	println(h.Value())