golang.org/x/arch/arm/armasm
golang.org/x/arch/arm64/arm64asm
golang.org/x/arch/ppc64/ppc64asm
golang.org/x/arch/x86/x86asm
# golang.org/x/build v0.0.0-20240603162849-5dfbda438323
## explicit; go 1.21
golang.org/x/build/relnote
# golang.org/x/mod v0.18.0
## explicit; go 1.18
golang.org/x/mod/internal/lazyregexp
golang.org/x/mod/modfile
golang.org/x/mod/module
golang.org/x/mod/semver
golang.org/x/mod/sumdb
golang.org/x/mod/sumdb/dirhash

}

const (
	spanSetBlockEntries = 512 // 4KB on 64-bit
	spanSetInitSpineCap = 256 // Enough for 1GB heap on 64-bit
)

type spanSetBlock struct {
	// Free spanSetBlocks are managed via a lock-free stack.
	lfnode

	// popped is the number of pop operations that have occurred on
	// this block. This number is used to help determine when a block
	// may be safely recycled.
	popped atomic.Uint32

// 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 relnote

import (
	"fmt"
	"strings"
	"unicode"
	"unicode/utf8"

	"golang.org/x/mod/module"
	md "rsc.io/markdown"
)

// addSymbolLinks looks for text like [Buffer] and
// [math.Max] and replaces them with links to standard library
// symbols and packages.

// Internally, the GC work pool is kept in arrays in work buffers.
// The gcWork interface caches a work buffer until full (or empty) to
// avoid contending on the global work buffer lists.

type workbufhdr struct {
	node lfnode // must be first
	nobj int
}

type workbuf struct {
	_ sys.NotInHeap
	workbufhdr
	// account for the above fields
	obj [(_WorkbufSize - unsafe.Sizeof(workbufhdr{})) / goarch.PtrSize]uintptr
}

	if goos == "darwin" || ((goos == "linux" || goos == "windows") && goarch == "amd64") {
		t.registerTest("API release note check", &goTest{variant: "check", pkg: "cmd/relnote", testFlags: []string{"-check"}})
		t.registerTest("API check", &goTest{variant: "check", pkg: "cmd/api", timeout: 5 * time.Minute, testFlags: []string{"-check"}})
	}

	// Runtime CPU tests.

	name      string
	file      string
	line      int32
	startLine int32
}

type itab = abi.ITab

// Lock-free stack node.
// Also known to export_test.go.
type lfnode struct {
	next    uint64
	pushcnt uintptr
}

type forcegcstate struct {
	lock mutex
	g    *g
	idle atomic.Bool
}

// A _defer holds an entry on the list of deferred calls.

// gcBgMarkWorker goroutine.
type gcBgMarkWorkerNode struct {
	// Unused workers are managed in a lock-free stack. This field must be first.
	node lfnode

	// The g of this worker.
	gp guintptr

	// Release this m on park. This is used to communicate with the unlock
	// function, which cannot access the G's stack. It is unused outside of