{"//line\n", valid, filename, 2, 1},        // missing colon
		{"//line foo\n", valid, filename, 2, 1},    // missing colon
		{"  //line foo:\n", valid, filename, 2, 1}, // not a line start
		{"//  line foo:\n", valid, filename, 2, 1}, // space between // and line

		// invalid //line directives with one colon
		{"//line :\n", "invalid line number: ", filename, 1, 9},

		return true
	}

	// "//[a-z0-9]+:[a-z0-9]"
	// (The // has been removed.)
	colon := strings.Index(c, ":")
	if colon <= 0 || colon+1 >= len(c) {
		return false
	}
	for i := 0; i <= colon+1; i++ {
		if i == colon {
			continue
		}
		b := c[i]
		if !('a' <= b && b <= 'z' || '0' <= b && b <= '9') {
			return false
		}
	}
	return true
}

      portString = hostAndPort[1];
    } else {
      int colonPos = hostPortString.indexOf(':');
      if (colonPos >= 0 && hostPortString.indexOf(':', colonPos + 1) == -1) {
        // Exactly 1 colon. Split into host:port.
        host = hostPortString.substring(0, colonPos);
        portString = hostPortString.substring(colonPos + 1);
      } else {
        // 0 or 2+ colons. Bare hostname or IPv6 literal.

		}
		if len(items) > 0 {
			operands = append(operands, items)
			if colon >= 0 && len(operands) == colon+2 {
				// AX:DX becomes DX, AX.
				operands[colon], operands[colon+1] = operands[colon+1], operands[colon]
				colon = -1
			}
		} else if len(operands) > 0 || tok == ',' || colon >= 0 {
			// Had a separator with nothing after.
			p.errorf("missing operand")
		}
	}

func splitHostPort(hostPort string) (host, port string) {
	host = hostPort

	colon := strings.LastIndexByte(host, ':')
	if colon != -1 && validOptionalPort(host[colon:]) {
		host, port = host[:colon], host[colon+1:]
	}

	if strings.HasPrefix(host, "[") && strings.HasSuffix(host, "]") {
		host = host[1 : len(host)-1]
	}

	return
}

	}

	for {
		kv, err := r.readContinuedLineSlice(maxMemory, mustHaveFieldNameColon)
		if len(kv) == 0 {
			return m, err
		}

		// Key ends at first colon.
		k, v, ok := bytes.Cut(kv, colon)
		if !ok {
			return m, ProtocolError("malformed MIME header line: " + string(kv))
		}
		key, ok := canonicalMIMEHeaderKey(k)
		if !ok {

      portString = hostAndPort[1];
    } else {
      int colonPos = hostPortString.indexOf(':');
      if (colonPos >= 0 && hostPortString.indexOf(':', colonPos + 1) == -1) {
        // Exactly 1 colon. Split into host:port.
        host = hostPortString.substring(0, colonPos);
        portString = hostPortString.substring(colonPos + 1);
      } else {
        // 0 or 2+ colons. Bare hostname or IPv6 literal.

	case *ast.InterfaceType:
		children = append(children,
			tok(n.Interface, len("interface")))

	case *ast.KeyValueExpr:
		children = append(children,
			tok(n.Colon, len(":")))

	case *ast.LabeledStmt:
		children = append(children,
			tok(n.Colon, len(":")))

	case *ast.MapType:
		children = append(children,
			tok(n.Map, len("map")))

	case *ast.ParenExpr:
		children = append(children,

func TestReadMIMEHeaderMalformed(t *testing.T) {
	inputs := []string{
		"No colon first line\r\nFoo: foo\r\n\r\n",
		" No colon first line with leading space\r\nFoo: foo\r\n\r\n",
		"\tNo colon first line with leading tab\r\nFoo: foo\r\n\r\n",
		" First: line with leading space\r\nFoo: foo\r\n\r\n",
		"\tFirst: line with leading tab\r\nFoo: foo\r\n\r\n",
		"Foo: foo\r\nNo colon second line\r\n\r\n",
		"Foo-\n\tBar: foo\r\n\r\n",

    private enum State {
        CollectValue, TraverseChildren, Done
    }

    private enum Separator {
        NewLine(true, TextUtil.getPlatformLineSeparator()),
        Empty(false, " "),
        Colon(false, ": "),
        ColonNewLine(true, ":" + TextUtil.getPlatformLineSeparator());

        Separator(boolean newLine, String text) {
            this.newLine = newLine;
            this.text = text;
        }