"path"
	"slices"
	"strings"
	"time"
)

// Writer provides sequential writing of a tar archive.
// [Writer.WriteHeader] begins a new file with the provided [Header],
// and then Writer can be treated as an io.Writer to supply that file's data.
type Writer struct {
	w    io.Writer
	pad  int64      // Amount of padding to write after current file entry
	curr fileWriter // Writer for current file entry

				// If the latest compatible version is allowed and has a go.mod file,
				// ignore any version with a higher (+incompatible) major version. (See
				// https://golang.org/issue/34165.) Note that we even prefer a
				// compatible pre-release over an incompatible release.
				ok, err := versionHasGoMod(ctx, module.Version{Path: qm.path, Version: lastCompatible})
				if err != nil {
					return nil, nil, err
				}

	isJump        bool             // Instruction being assembled is a jump.
	allowABI      bool             // Whether ABI selectors are allowed.
	pkgPrefix     string           // Prefix to add to local symbols.
	errorWriter   io.Writer
}

type Patch struct {
	addr  *obj.Addr
	label string
}

func NewParser(ctxt *obj.Link, ar *arch.Arch, lexer lex.TokenReader) *Parser {
	pkgPrefix := obj.UnlinkablePkg
	if ctxt != nil {

	return nil
}

func testContext(t testing.TB) context.Context {
	w := newTestWriter(t)
	return cfg.WithBuildXWriter(context.Background(), w)
}

// A testWriter is an io.Writer that writes to a test's log.
//
// The writer batches written data until the last byte of a write is a newline
// character, then flushes the batched data as a single call to Logf.
// Any remaining unflushed data is logged during Cleanup.

// so RotRight(x, k) > ⎣x/(2^k)⎦
//
// Finally, if x > a and has k trailing zero bits, then RotRight(x, k) == ⎣x/(2^k)⎦
// and ⎣x/(2^k)⎦ must be greater than ⎣a/(2^k)⎦, that is the top n-k bits of x must
// be greater than the top n-k bits of a because the rest of x bits are zero.
//
// So the two conditions about can be replaced with the single test
//
// RotRight(x*m mod 2^n, k) <= ⎣(2^n - 1)/c⎦
//

	//
	// During type inference, an object's color changes from white to grey
	// to black (pre-declared objects are painted black from the start).
	// A black object (i.e., its type) can only depend on (refer to) other black
	// ones. White and grey objects may depend on white and black objects.
	// A dependency on a grey object indicates a cycle which may or may not be
	// valid.
	//

	}
	for m := range modpkgs {
		if !isExplicit[m] {
			vendorMods = append(vendorMods, m)
		}
	}
	gover.ModSort(vendorMods)

	var (
		buf bytes.Buffer
		w   io.Writer = &buf
	)
	if cfg.BuildV {
		w = io.MultiWriter(&buf, os.Stderr)
	}

	if modload.MainModules.WorkFile() != nil {
		fmt.Fprintf(w, "## workspace\n")
	}

			os.Remove(dst + "~")
		}
		df, err = os.OpenFile(dst, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, perm)
	}
	if err != nil {
		return fmt.Errorf("copying %s: %w", src, err) // err should already refer to dst
	}

	_, err = io.Copy(df, sf)
	df.Close()
	if err != nil {
		mayberemovefile(dst)
		return fmt.Errorf("copying %s to %s: %v", src, dst, err)
	}
	return nil
}

// during the build. (How does the compiler binary know its own content hash?
// We store it there using updateBuildID after the standard link step.)
//
// A final twist is that we'd prefer to have reproducible builds for release toolchains.
// It should be possible to cross-compile for Windows from either Linux or Mac
// or Windows itself and produce the same binaries, bit for bit. If the tool ID,

// size. If the argument io.Writer is already a [Writer] with large enough
// size, it returns the underlying [Writer].
func NewWriterSize(w io.Writer, size int) *Writer {
	// Is it already a Writer?
	b, ok := w.(*Writer)
	if ok && len(b.buf) >= size {
		return b
	}
	if size <= 0 {
		size = defaultBufSize
	}
	return &Writer{
		buf: make([]byte, size),
		wr:  w,
	}
}