// The text in new is of the form
//
//	var whatever = T{
//		...
//	}
//
// Replace searches file for an exact match for the text of the first line,
// finds the closing brace, and then substitutes new for what used to be in the file.
// This lets us update the regressGolden table during go test -update.
func replace(t *testing.T, file string, new []byte) {
	first, _, _ := bytes.Cut(new, []byte("\n"))

//	                 ::= fpT
//
//	<braced-expression> ::= <expression>
//	                    ::= di <field source-name> <braced-expression>
//	                    ::= dx <index expression> <braced-expression>
//	                    ::= dX <range begin expression> <range end expression> <braced-expression>
func (st *state) expression() AST {
	if len(st.str) == 0 {

        file("src/main/java/org/gradle/Class2.java") <<
            "package org.gradle; public class Class2 { public void doit() { boolean x = true; if (x) x = false; } }" // missing braces
    }

pkg go/ast, type FuncType struct, TypeParams *FieldList
pkg go/ast, type IndexListExpr struct
pkg go/ast, type IndexListExpr struct, Indices []Expr
pkg go/ast, type IndexListExpr struct, Lbrack token.Pos
pkg go/ast, type IndexListExpr struct, Rbrack token.Pos
pkg go/ast, type IndexListExpr struct, X Expr
pkg go/ast, type TypeSpec struct, TypeParams *FieldList
pkg go/constant, method (Kind) String() string
pkg go/token, const TILDE = 88

 */
internal fun String.toCanonicalHost(): String? {
  val host: String = this

  // If the input contains a :, it’s an IPv6 address.
  if (":" in host) {
    // If the input is encased in square braces "[...]", drop 'em.
    val inetAddressByteArray =
      (
        if (host.startsWith("[") && host.endsWith("]")) {
          decodeIpv6(host, 1, host.length - 1)
        } else {

			// Drop trailing blank lines.
			end = i
			for end > start && lines[end-1] == "" {
				end--
			}

			// If indented lines are followed (without a blank line)
			// by an unindented line ending in a brace,
			// take that one line too. This fixes the common mistake
			// of pasting in something like
			//
			// func main() {
			//	fmt.Println("hello, world")
			// }
			//
			// and forgetting to indent it.

		if s != tt.Regexp {
			// If ToString didn't return the original regexp,
			// it must have found one with fewer parens.
			// Unfortunately we can't check the length here, because
			// ToString produces "\\{" for a literal brace,
			// but "{" is a shorter equivalent in some contexts.
			nre, err := Parse(s, testFlags)
			if err != nil {
				t.Errorf("Parse(%#q.String() = %#q): %v", tt.Regexp, s, err)
				continue
			}

func (check *Checker) validType0(pos token.Pos, typ Type, nest, path []*Named) bool {
	typ = Unalias(typ)

	if check.conf._Trace {
		if t, _ := typ.(*Named); t != nil && t.obj != nil /* obj should always exist but be conservative */ {
			pos = t.obj.pos
		}
		check.indent++
		check.trace(pos, "validType(%s) nest %v, path %v", typ, pathString(makeObjList(nest)), pathString(makeObjList(path)))
		defer func() {
			check.indent--

      builder.append(args[i++]);
      templateStart = placeholderStart + 2;
    }
    builder.append(template, templateStart, template.length());

    // if we run out of placeholders, append the extra args in square braces
    if (i < args.length) {
      builder.append(" [");
      builder.append(args[i++]);
      while (i < args.length) {
        builder.append(", ");
        builder.append(args[i++]);
      }

      builder.append(args[i++]);
      templateStart = placeholderStart + 2;
    }
    builder.append(template, templateStart, template.length());

    // if we run out of placeholders, append the extra args in square braces
    if (i < args.length) {
      builder.append(" [");
      builder.append(args[i++]);
      while (i < args.length) {
        builder.append(", ");
        builder.append(args[i++]);
      }