bool isValidIdentifierChar(char c) {
  return isLcAlpha(c) || std::isdigit(c) || c == '_' || c == '-' || c == '*' ||
    c == '/';
}
bool isValidIdentifierChar(char c) {
  return isLcAlpha(c) || std::isdigit(c) || c == '_' || c == '-' || c == '*' ||
    c == '/';
}