message: Switched to use match statement.
  Complete ditz moment and wrote let x = if let instead of just a match.
diff: @@ -222,11 +222,9 @@ impl<'a> CoverageVisitor<'a> {
  fn cover_lines(&mut self, span: Span) {
  if let Ok(ls) = self.codemap.span_to_lines(span) {
  - let temp_string = if let Ok(s) = self.codemap.span_to_snippet(span) {
  - s
  - } else {
  - // First line is always declaration so this is fine.
  - "fn".to_string()
  + let temp_string = match self.codemap.span_to_snippet(span) {
  + Ok(s) => s,
  + Err(_) => "fn".to_string(),
  };
  let txt = temp_string.lines();
  let mut is_comment = false;
  