message: fix indented blocks in rustdoc to avoid running them as code during test
diff: @@ -2163,6 +2163,8 @@ class RustWrapperGenerator(object):
  text = re.sub("\\\\f\[", "<div lang='latex'>", text, 0, re.M)
  text = re.sub("\\\\f\]", "</div>", text, 0, re.M)
  text = re.sub(r"\\f\$(.*?)\\f\$", "<span lang='latex'>\\1</span>", text, 0, re.M)
  + # catch sequences of 4 indents and reduce them to avoid cargo test running them as code
  + text = re.sub(r"^((\s{1,5})\2{3})(\S)", r"\2\3", text, 0, re.M)
  text = re.sub("^", "/// ", text.strip(), 0, re.M) + "\n"
  return text
  