mounts, _ := ReadFile("/proc/mounts")
				if strings.Contains(string(mounts), "reiserfs") {
					// Reiserfs rejects the big seeks.
					t.Skipf("skipping test known to fail on reiserfs; https://golang.org/issue/91")
				}
			}
			t.Errorf("#%d: Seek(%v, %v) = %v, %v want %v, nil", i, tt.in, tt.whence, off, err, tt.out)
		}
	}
}