// Package relnote supports working with release notes.
//
// Its main feature is the ability to merge Markdown fragments into a single
// document. (See [Merge].)
//
// This package has minimal imports, so that it can be vendored into the
// main go repo.
package relnote

import (
	"bufio"
	"bytes"
	"errors"
	"fmt"
	"io"
	"io/fs"
	"path"
	"regexp"
	"slices"
	"strconv"

		f, err := os.Open(filename)
		if err != nil {
			return nil, err
		}
		in = f
		defer func() {
			f.Close()
			<-fdSem
		}()
	}

	// Compute the file's size and read its contents with minimal allocations.
	//
	// If we have the FileInfo from filepath.WalkDir, use it to make
	// a buffer of the right size and avoid ReadAll's reallocations.
	//

		return a.Type().Alignment() > b.Type().Alignment()
	}

	// Sort normal variables before open-coded-defer slots, so that the
	// latter are grouped together and near the top of the frame (to
	// minimize varint encoding of their varp offset).
	if a.OpenDeferSlot() != b.OpenDeferSlot() {
		return a.OpenDeferSlot()
	}

	// If a and b are both open-coded defer slots, then order them by

		"For memory profiles, use megabytes, kilobytes, bytes, etc.",
		"Using auto will scale each value independently to the most natural unit."),
	"compact_labels": "Show minimal headers",
	"source_path":    "Search path for source files",
	"trim_path":      "Path to trim from source paths before search",
	"intel_syntax": helpText(
		"Show assembly in Intel syntax",

	fmtStr(ustar.userName(), hdr.Uname)
	fmtStr(ustar.groupName(), hdr.Gname)
	fmtNum(ustar.devMajor(), hdr.Devmajor)
	fmtNum(ustar.devMinor(), hdr.Devminor)

	return &tw.blk
}

// writeRawFile writes a minimal file with the given name and flag type.
// It uses format to encode the header format and will write data as the body.
// It uses default values for all of the other fields (as BSD and GNU tar does).

// The complete result is equal to
// `bytes.Join(append(fullBuffers, finalFragment), nil)`, which has a
// length of `totalLen`. The result is structured in this way to allow callers
// to minimize allocations and copies.
func (b *Reader) collectFragments(delim byte) (fullBuffers [][]byte, finalFragment []byte, totalLen int, err error) {
	var frag []byte
	// Use ReadSlice to look for delim, accumulating full buffers.

func (versionFlag) Set(s string) error {
	if s != "full" {
		log.Fatalf("unsupported flag value: -V=%s (use -V=full)", s)
	}

	// This replicates the minimal subset of
	// cmd/internal/objabi.AddVersionFlag, which is private to the
	// go tool yet forms part of our command-line interface.
	// TODO(adonovan): clarify the contract.

	// Print the tool version so the build system can track changes.
	// Formats:

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

// Package mvs implements Minimal Version Selection.
// See https://research.swtch.com/vgo-mvs.
package mvs

import (
	"fmt"
	"slices"
	"sort"
	"sync"

	"cmd/go/internal/par"

	"golang.org/x/mod/module"
)

// A Reqs is the requirement graph on which Minimal Version Selection (MVS) operates.
//

	} else {
		n = walkStmt(n)
	}
	init.Append(n)
}

// The max number of defers in a function using open-coded defers. We enforce this
// limit because the deferBits bitmask is currently a single byte (to minimize code size)
const maxOpenDefers = 8

// backingArrayPtrLen extracts the pointer and length from a slice or string.
// This constructs two nodes referring to n, so n must be a cheapExpr.

	}
}

// Experiment configuration.
var (
	// RawGOEXPERIMENT is the GOEXPERIMENT value set by the user.
	RawGOEXPERIMENT = envOr("GOEXPERIMENT", buildcfg.DefaultGOEXPERIMENT)
	// CleanGOEXPERIMENT is the minimal GOEXPERIMENT value needed to reproduce the
	// experiments enabled by RawGOEXPERIMENT.
	CleanGOEXPERIMENT = RawGOEXPERIMENT

	Experiment    *buildcfg.ExperimentFlags
	ExperimentErr error
)

func init() {