// Literal method needs to scan the pattern.
		re := MustCompile(tc.pattern)
		str, complete := re.LiteralPrefix()
		if complete != tc.isLiteral {
			t.Errorf("LiteralPrefix(`%s`) = %t; want %t", tc.pattern, complete, tc.isLiteral)
		}
		if str != tc.literal {
			t.Errorf("LiteralPrefix(`%s`) = `%s`; want `%s`", tc.pattern, str, tc.literal)
		}
	}
}

type subexpIndex struct {

		for _, pkg := range m.Pkgs {
			if pkg == "" {
				panic(fmt.Sprintf("ImportPaths returned empty package for pattern %s", m.Pattern()))
			}
			mode := cmdlinePkg
			if m.IsLiteral() {
				// Note: do not set = m.IsLiteral unconditionally
				// because maybe we'll see p matching both
				// a literal and also a non-literal pattern.
				mode |= cmdlinePkgLiteral
			}

				// the loader iterations.
				m.Pkgs = m.Pkgs[:0]
				for _, dir := range m.Dirs {
					pkg, err := resolveLocalPackage(ctx, dir, rs)
					if err != nil {
						if !m.IsLiteral() && (err == errPkgIsBuiltin || err == errPkgIsGorootSrc) {
							continue // Don't include "builtin" or GOROOT/src in wildcard patterns.
						}

						// If we're outside of a module, ensure that the failure mode

		{"(*FileSet).Write", Method, 0},
		{"(*Position).IsValid", Method, 0},
		{"(Pos).IsValid", Method, 0},
		{"(Position).String", Method, 0},
		{"(Token).IsKeyword", Method, 0},
		{"(Token).IsLiteral", Method, 0},
		{"(Token).IsOperator", Method, 0},
		{"(Token).Precedence", Method, 0},
		{"(Token).String", Method, 0},
		{"ADD", Const, 0},
		{"ADD_ASSIGN", Const, 0},
		{"AND", Const, 0},

			sz := l.sizeEstimate(*target)

			// Worst case size is where is that a separator of "" is used, and each char is returned as a list element.
			max := sz.Max
			if len(args) > 1 {
				if v := args[1].Expr().AsLiteral(); v != nil {
					if i, ok := v.Value().(int64); ok {
						max = uint64(i)
					}
				}
			}
			// Cost is the traversal plus the construction of the result.

	return l.goString(0, "")
}

func (l *Literal) goString(indent int, field string) string {
	var neg string
	if l.Neg {
		neg = " Neg: true"
	}
	return fmt.Sprintf("%*s%sLiteral:%s\n%s\n%*sVal: %s", indent, "", field,
		neg, l.Type.goString(indent+2, "Type: "),
		indent+2, "", l.Val)
}

func (l *Literal) prec() precedence {
	return precPrimary
}