// supports the usual quotings (", variable length double brackets) except ' quoting
static boolean isQuoted(S s) {
  ifdef isQuoted_dirty
  if (isNormalQuoted_dirty(s)) true;
  endifdef
  ifndef isQuoted_dirty
  if (isNormalQuoted(s)) true; // use the exact version
  endifndef
  ret isMultilineQuoted(s);
}