message: Dump fn ptr ABIs.
diff: @@ -420,7 +420,12 @@ impl<'a, 'tcx> Memory<'a, 'tcx> {
  (Some(a), None) => a,
  (None, Some(fn_def)) => {
  let name = ty::tls::with(|tcx| tcx.item_path_str(fn_def.def_id));
  - trace!("{} function pointer: {}: {}", msg, name, fn_def.sig);
  + let abi = if fn_def.abi == Abi::Rust {
  + format!("")
  + } else {
  + format!("extern {} ", fn_def.abi)
  + };
  + trace!("{} function pointer: {}: {}{}", msg, name, abi, fn_def.sig);
  continue;
  },
  (None, None) => {
  