message: Remove some ResolvedSpan methods
  Summary: Inline and simplify them.
diff: @@ -342,21 +342,14 @@ pub struct ResolvedSpan {
  pub end_column: usize,
  }
  -impl ResolvedSpan {
  - fn spans_only_one_line(&self) -> bool {
  - self.begin_line == self.end_line
  - }
  -
  - fn is_empty_span(&self) -> bool {
  - self.begin_line == self.end_line && self.begin_column == self.end_column
  - }
  -}
  -
  impl Display for ResolvedSpan {
  fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
  - if self.is_empty_span() {
  + let single_line = self.begin_line == self.end_line;
  + let is_empty = single_line && self.begin_column == self.end_column;
  +
  + if is_empty {
  write!(f, "{}:{}", self.begin_line + 1, self.begin_column + 1)
  - } else if self.spans_only_one_line() {
  + } else if single_line {
  write!(
  f,
  "{}:{}-{}",
  