docs: def _pop_comment_block(self, statements, header_re):
          """Look for a series of comments that start with one that matches the
          regex. If the first comment is found, all subsequent comments are
          popped from statements, concatenated and dedented and returned.
          """
          res = []
          comments = []
          match = None
          st_iter = iter(statements)
          # Look for the header
          for st in st_iter:
              if isinstance(st, ast.Comment):
                  match = header_re.match(st.text)
                  if match:
                      # Drop this comment an move on to consuming the block
                      break
                  else:
                      res.append(st)
              else:
                  res.append(st)
          # Consume consecutive comments
          for st in st_iter:
              if isinstance(st, ast.Comment):
                  comments.append(st)
              else:
                  # The block is over, keep the rest of the statements
                  res.append(st)
                  break
          # Keep the rest of the statements
          res.extend(list(st_iter))
          # Inside the comment block, drop the pound sign and any common indent
          return match, dedent("".join(c.text[1:] + "\n" for c in comments)), res