message: detect another printing function for nicer error
diff: @@ -759,7 +759,8 @@ impl<'a, 'mir, 'tcx: 'mir + 'a> EvalContextExt<'tcx> for EvalContext<'a, 'mir, '
  match &path[..] {
  // A Rust function is missing, which means we are running with MIR missing for libstd (or other dependencies).
  // Still, we can make many things mostly work by "emulating" or ignoring some functions.
  - "std::io::_print" => {
  + "std::io::_print" |
  + "std::io::_eprint" => {
  warn!(
  "Ignoring output. To run programs that print, make sure you have a libstd with full MIR."
  );
  