if err != nil {
		return nil, err
	}
	ff, err := NewFatFile(f)
	if err != nil {
		f.Close()
		return nil, err
	}
	ff.closer = f
	return ff, nil
}

func (ff *FatFile) Close() error {
	var err error
	if ff.closer != nil {
		err = ff.closer.Close()
		ff.closer = nil
	}
	return err

	ANDCC	$PAGE_OFFSET, R4, R9
	SUBC	R5, $8, R12		// 8-len
	SLD	$3, R12, R14		// (8-len)*8
	CMPU	R6, R12, CR1		// Enough bytes lower in the page to load lower?
	CMPU	R9, R12, CR0
	SUB	R12, R8, R6		// compute lower load address
	SUB	R12, R4, R9
	ISEL	CR1LT, R8, R6, R8	// R8 = R6 < 0 ? R8 (&s1) : R6 (&s1 - (8-len))
	ISEL	CR0LT, R4, R9, R4	// Similar for s2
	MOVD	(R8), R15
	MOVD	(R4), R16
	SLD	R14, R15, R7

	if l != lower {
		t.Errorf("Lower(lower) is %s not %s", l, lower)
	}
	l = ToLowerSpecial(unicode.TurkishCase, upper)
	if l != lower {
		t.Errorf("Lower(upper) is %s not %s", l, lower)
	}
}

func TestTrimSpace(t *testing.T) { runStringTests(t, TrimSpace, "TrimSpace", trimSpaceTests) }

var trimTests = []struct {
	f            string
	in, arg, out string
}{
	{"Trim", "abba", "a", "bb"},

	w.hasWritten = true
	return w.Writer.Write(p)
}

// Close closes the WriteOnCloser. It behaves like io.Closer.
func (w *WriteOnCloser) Close() error {
	if !w.hasWritten {
		_, err := w.Write(nil)
		if err != nil {
			return err
		}
	}
	if closer, ok := w.Writer.(io.Closer); ok {
		return closer.Close()
	}
	return nil
}

// HasWritten returns true if at least one write operation was performed.

 *
 * <pre>{@code
 * FluentFuture<UserName> userName =
 *     ClosingFuture.submit(
 *             closer -> closer.eventuallyClose(database.newTransaction(), closingExecutor),
 *             executor)
 *         .transformAsync((closer, transaction) -> transaction.queryClosingFuture("..."), executor)
 *         .transform((closer, result) -> result.get("userName"), directExecutor())

	var buf [10]byte
	lower := buf[:0]
	const utf8RuneSelf = 0x80 // from utf8 package, but not importing it.
	for i := 0; i < len(ext); i++ {
		c := ext[i]
		if c >= utf8RuneSelf {
			// Slow path.
			si, _ := mimeTypesLower.Load(strings.ToLower(ext))
			s, _ := si.(string)
			return s
		}
		if 'A' <= c && c <= 'Z' {
			lower = append(lower, c+('a'-'A'))
		} else {

	invalidOp  = "invalid operation: "
)

// The poser interface is used to extract the position of type-checker errors.
type poser interface {
	Pos() syntax.Pos
}

func (check *Checker) error(at poser, code Code, msg string) {
	err := check.newError(code)
	err.addf(at, "%s", msg)
	err.report()
}

func (check *Checker) errorf(at poser, code Code, format string, args ...any) {
	err := check.newError(code)

                    if (lower == null || upper == null || lower.compareTo(upper) != 0) {
                        restrictions.add(new Restriction(lower, lowerInclusive, upper, upperInclusive));
                    } else if (lowerInclusive && upperInclusive) {
                        restrictions.add(new Restriction(lower, lowerInclusive, upper, upperInclusive));
                    }

func computeBounds(mant uint64, exp int, flt *floatInfo) (lower, central, upper uint64, e2 int) {
	if mant != 1<<flt.mantbits || exp == flt.bias+1-int(flt.mantbits) {
		// regular case (or denormals)
		lower, central, upper = 2*mant-1, 2*mant, 2*mant+1
		e2 = exp - 1
		return
	} else {
		// border of an exponent
		lower, central, upper = 4*mant-1, 4*mant, 4*mant+2
		e2 = exp - 2
		return
	}
}

 * Matches version ranges:
 * <ul>
 * <li>[1.0,2.0] matches all versions greater or equal to 1.0 and lower or equal to 2.0 </li>
 * <li>[1.0,2.0[ matches all versions greater or equal to 1.0 and lower than 2.0 </li>
 * <li>]1.0,2.0] matches all versions greater than 1.0 and lower or equal to 2.0 </li>
 * <li>]1.0,2.0[ matches all versions greater than 1.0 and lower than 2.0 </li>
 * <li>[1.0,) matches all versions greater or equal to 1.0 </li>