{"//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},

// fn for each row. readColonFile returns a value, an error, or (nil, nil) if
// the end of the file is reached without a match.
//
// readCols is the minimum number of colon-separated fields that will be passed
// to fn; in a long line additional fields may be silently discarded.
func readColonFile(r io.Reader, fn lineFunc, readCols int) (v any, err error) {
	rd := bufio.NewReader(r)

		case len(hostport):
			// There can't be a ':' behind the ']' now.
			return addrErr(hostport, missingPort)
		case i:
			// The expected result.
		default:
			// Either ']' isn't followed by a colon, or it is
			// followed by a colon that is not the last one.
			if hostport[end+1] == ':' {
				return addrErr(hostport, tooManyColons)
			}
			return addrErr(hostport, missingPort)
		}
		host = hostport[1:end]

	return x
}

func (p *parser) parseElement() ast.Expr {
	if p.trace {
		defer un(trace(p, "Element"))
	}

	x := p.parseValue()
	if p.tok == token.COLON {
		colon := p.pos
		p.next()
		x = &ast.KeyValueExpr{Key: x, Colon: colon, Value: p.parseValue()}
	}

	return x
}

func (p *parser) parseElementList() (list []ast.Expr) {
	if p.trace {
		defer un(trace(p, "ElementList"))

	}

	if p.tok == token.LBRACE {
		return p.parseLiteralValue(nil)
	}

	x := p.parseExpr(keyOk) // don't resolve if map key
	if keyOk {
		if p.tok == token.COLON {
			colon := p.pos
			p.next()
			return &ast.KeyValueExpr{x, colon, p.parseElement(false)}
		}
		p.resolve(x) // not a map key
	}

	return x
}

func (p *parser) parseElementList() (list []ast.Expr) {
	if p.trace {

		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
}

			continue
		}
		result[n] = b
		n++
	}

	return result[0:n]
}

var pemStart = []byte("\n-----BEGIN ")
var pemEnd = []byte("\n-----END ")
var pemEndOfLine = []byte("-----")
var colon = []byte(":")

// Decode will find the next PEM formatted block (certificate, private key
// etc) in the input. It returns that block and the remainder of the input. If

      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.

        'us%5B%5B%23%3B%C3%BCr:pas%23:%5D()' | 'us[[#;ür' | 'pas#:]()'
        'user'                               | null       | null
    }

    def "username cannot contain colon"() {
        // Known limitation. The user should use the DSL
        when:
        def credentials = extractCredentialsFromUserInfo(new URI("https://us%3Aer:******@****.***"))

        then:

		}
		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")
		}
	}