pkg os/exec, method (*Cmd) Environ() []string #50599
pkg os/exec, type Cmd struct, Err error #43724
pkg os/exec, var ErrDot error #43724
pkg regexp/syntax, const ErrNestingDepth = "expression nests too deeply" #51684
pkg regexp/syntax, const ErrNestingDepth ErrorCode #51684
pkg runtime/debug, func SetMemoryLimit(int64) int64 #48409
pkg sort, func Find(int, func(int) int) (int, bool) #50340

	defer func() {
		switch r := recover(); r {
		default:
			panic(r)
		case nil:
			// ok
		case ErrLarge: // too big
			err = &Error{Code: ErrLarge, Expr: s}
		case ErrNestingDepth:
			err = &Error{Code: ErrNestingDepth, Expr: s}
		}
	}()

	if flags&Literal != 0 {
		// Trivial parser for literal string.
		if err := checkUTF8(s); err != nil {
			return nil, err
		}

		{"ErrInvalidUTF8", Const, 0},
		{"ErrLarge", Const, 20},
		{"ErrMissingBracket", Const, 0},
		{"ErrMissingParen", Const, 0},
		{"ErrMissingRepeatArgument", Const, 0},
		{"ErrNestingDepth", Const, 19},
		{"ErrTrailingBackslash", Const, 0},
		{"ErrUnexpectedParen", Const, 1},
		{"Error", Type, 0},
		{"Error.Code", Field, 0},
		{"Error.Expr", Field, 0},
		{"ErrorCode", Type, 0},