message: Cleanup error result test
diff: @@ -712,15 +712,14 @@ mod test {
  assert_eq!(d, Uint128(323456));
  // error result on underflow (- would produce negative result)
  - let underflow = a - b;
  - match underflow {
  - Ok(_) => panic!("should error"),
  - Err(StdError::Underflow {
  + let underflow_result = a - b;
  + match underflow_result.unwrap_err() {
  + StdError::Underflow {
  minuend,
  subtrahend,
  ..
  - }) => assert_eq!((minuend, subtrahend), (a.to_string(), b.to_string())),
  - _ => panic!("expected underflow error"),
  + } => assert_eq!((minuend, subtrahend), (a.to_string(), b.to_string())),
  + err => panic!("Unexpected error: {:?}", err),
  }
  }
  