return nil, fmt.Errorf("unknown or unsupported Go version 1.%d", v)
	}
	tr.v = v
	tr.specs = v.Specs()
	tr.names = event.Names(tr.specs)
	for _, r := range line {
		if !unicode.IsSpace(r) {
			return nil, fmt.Errorf("encountered unexpected non-space at the end of the header: %q", line)
		}
	}
	return tr, nil
}

// Version returns the version of the trace that we're reading.
func (r *TextReader) Version() version.Version {

	names []string
}

// Not even worth sorting
var aSpace []opSet

// RegisterOpcode binds a list of instruction names
// to a given instruction number range.
func RegisterOpcode(lo As, Anames []string) {
	if len(Anames) > AllowedOpCodes {
		panic(fmt.Sprintf("too many instructions, have %d max %d", len(Anames), AllowedOpCodes))
	}
	aSpace = append(aSpace, opSet{lo, Anames})
}

func (a As) String() string {

	rest = strings.TrimLeftFunc(v, unicode.IsSpace)
	if !strings.HasPrefix(rest, ";") {
		return "", "", v
	}

	rest = rest[1:] // consume semicolon
	rest = strings.TrimLeftFunc(rest, unicode.IsSpace)
	param, rest = consumeToken(rest)
	param = strings.ToLower(param)
	if param == "" {
		return "", "", v
	}

	rest = strings.TrimLeftFunc(rest, unicode.IsSpace)
	if !strings.HasPrefix(rest, "=") {

		line = line[:i]
	}

	verb := line
	if i := strings.IndexFunc(verb, unicode.IsSpace); i >= 0 {
		verb = verb[:i]
		if line[i] != ' ' && line[i] != '\t' && line[i] != '\n' {
			r, _ := utf8.DecodeRuneInString(line[i:])
			check.pass.Reportf(pos, "invalid space %#q in %s directive", r, verb)
		}
	}

	switch verb {
	default:
		// TODO: Use the go language version for the file.

	for _, r := range s {
		if !unicode.IsGraphic(r) || unicode.IsSpace(r) || strings.ContainsRune(illegalChars, r) {
			return false
		}
	}
	return s != ""
}

// parseGoEmbed parses the text following "//go:embed" to extract the glob patterns.
// It accepts unquoted space-separated patterns as well as double-quoted and back-quoted Go strings.

}

// Trim leading and trailing spaces and replace sequential spaces with one space, following Trimall()
// in http://docs.aws.amazon.com/general/latest/gr/sigv4-create-canonical-request.html
func signV4TrimAll(input string) string {
	// Compress adjacent spaces (a space is determined by
	// unicode.IsSpace() internally here) to one space and return
	return strings.Join(strings.Fields(input), " ")
}

// this assumes the four fastcall registers were first spilled
// to the shadow space.
type abiDesc struct {
	parts []abiPart

	srcStackSize uintptr // stdcall/fastcall stack space tracking
	dstStackSize uintptr // Go stack space used
	dstSpill     uintptr // Extra stack space for argument spill slots
	dstRegisters int     // Go ABI int argument registers used

	// provide addresses outside of those 33 bits. Pick 40 bits
	// as a reasonable balance between address space usage by the
	// page allocator, and flexibility for what mmap'd regions
	// we'll accept for the heap. We can't just move to the full
	// 48 bits because this uses too much address space for older
	// iOS versions.
	// TODO(mknyszek): Once iOS <14 is deprecated, promote ios/arm64

	// non-doubled quote may appear in a quoted field.
	LazyQuotes bool

	// If TrimLeadingSpace is true, leading white space in a field is ignored.
	// This is done even if the field delimiter, Comma, is white space.
	TrimLeadingSpace bool

	// ReuseRecord controls whether calls to Read may return a slice sharing
	// the backing array of the previous call's returned slice for performance.

Regular Reads will block until data is available, but not wait for a full buffer. 
Writes will block until there is space available and writes bigger than the buffer will wait for reads to make space.

`TryRead` and `TryWrite` are still available for non-blocking reads and writes.

To signify the end of the stream, close the ring buffer from the writer side with `rb.CloseWriter()`