message: Use err_unsup_format instead
diff: @@ -101,9 +101,8 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
  if this.machine.communicate {
  // Fill the buffer using the host's rng.
  - getrandom::getrandom(&mut data).map_err(|err| {
  - InterpError::Unsupported(UnsupportedOpInfo::Unsupported(err.to_string()))
  - })?;
  + getrandom::getrandom(&mut data)
  + .map_err(|err| err_unsup_format!("getrandom failed: {}", err))?;
  }
  else {
  let rng = this.memory_mut().extra.rng.get_mut();
  