f.err = CorruptInputError(f.roffset)
				return 0, f.err
			}
			f.b = b >> (n & 31)
			f.nb = nb - n
			return int(chunk >> huffmanValueShift), nil
		}
	}
}

func (f *decompressor) makeReader(r io.Reader) {
	if rr, ok := r.(Reader); ok {
		f.rBuf = nil
		f.r = rr
		return
	}
	// Reuse rBuf if possible. Invariant: rBuf is always created (and owned) by decompressor.
	if f.rBuf != nil {

func TestMultiReaderFlatten(t *testing.T) {
	pc := make([]uintptr, 1000) // 1000 should fit the full stack
	n := runtime.Callers(0, pc)
	var myDepth = callDepth(pc[:n])
	var readDepth int // will contain the depth from which fakeReader.Read was called
	var r Reader = MultiReader(readerFunc(func(p []byte) (int, error) {
		n := runtime.Callers(1, pc)
		readDepth = callDepth(pc[:n])
		return 0, errors.New("irrelevant")
	}))