message: Heap: gate hole publicity on test
diff: @@ -28,9 +28,9 @@ pub struct Heap {
  index: usize,
  bottom: usize,
  size: usize,
  - #[cfg(target_os = "none")]
  + #[cfg(not(test))]
  holes: HoleList,
  - #[cfg(not(target_os = "none"))]
  + #[cfg(test)]
  pub holes: HoleList,
  }
  