continue
				}
				if hash != h {
					errorf("bufSize=%d j=%d k=%d: findAndHash: matches correct, but hash=%x, want %x", bufSize, j, k, hash, h)
				}
			}
		}
	}
}

func TestExcludedReader(t *testing.T) {
	const s = "0123456789abcdefghijklmn"
	tests := []struct {
		start, end int64    // excluded range
		results    []string // expected results of reads
	}{