// The full name of a test Bar in test case Foo is defined as
  // "Foo.Bar".  Only the tests that match the filter will run.
  //
  // A filter is a colon-separated list of glob (not regex) patterns,
  // optionally followed by a '-' and a colon-separated list of
  // negative patterns (tests to exclude).  A test is run if it
  // matches one of the positive patterns and does not match any of
  // the negative patterns.

            while (++i < limit) {
              if (input[i] == ']') break
            }
          }
          ':' -> return i
        }
        i++
      }
      return limit // No colon.
    }

    private fun parsePort(
      input: String,
      pos: Int,
      limit: Int,
    ): Int {
      return try {
        // Canonicalize the port string to skip '\n' etc.

			`<a style="background: '#ZgotmplZ'">`,
		},
		{
			"styleStrEncodedProtocolEncoded",
			`<a style="background: '{{"javascript\\3a alert(1337)"}}'">`,
			// The CSS string 'javascript\\3a alert(1337)' does not contain a colon.
			`<a style="background: 'javascript\\3a alert\28 1337\29 '">`,
		},
		{
			"styleURLGoodProtocolPassed",
			`<a style="background: url('{{"http://oreilly.com/O'Reilly Animals(1)<2>;{}.html"}}')">`,

// optionally space-separated key:"value" pairs.
// Each key is a non-empty string consisting of non-control
// characters other than space (U+0020 ' '), quote (U+0022 '"'),
// and colon (U+003A ':').  Each value is quoted using U+0022 '"'
// characters and Go string literal syntax.
type StructTag string

// Get returns the value associated with key in the tag string.

//
// With HTTP Basic Authentication the provided username and password
// are not encrypted. It should generally only be used in an HTTPS
// request.
//
// The username may not contain a colon. Some protocols may impose
// additional requirements on pre-escaping the username and
// password. For instance, when used with OAuth2, both arguments must
// be URL encoded first with [url.QueryEscape].

		}

		// #cgo (nocallback|noescape) <function name>
		if fields := strings.Fields(line); len(fields) == 3 && (fields[1] == "nocallback" || fields[1] == "noescape") {
			continue
		}

		// Split at colon.
		line, argstr, ok := strings.Cut(strings.TrimSpace(line[4:]), ":")
		if !ok {
			return fmt.Errorf("%s: invalid #cgo line: %s", filename, orig)
		}

		// Parse GOOS/GOARCH stuff.

	if err := WriteFile(filepath.Join(d, "control.txt"), []byte(string("Hello, world!")), 0644); err != nil {
		t.Fatal(err)
	}
	if err := WriteFile(filepath.Join(d, `e:xperi\ment.txt`), []byte(string("Hello, colon and backslash!")), 0644); err != nil {
		t.Fatal(err)
	}

	fsys := DirFS(d)
	err := fs.WalkDir(fsys, ".", func(path string, e fs.DirEntry, err error) error {
		if fs.ValidPath(e.Name()) {