code: func (st *state) cloneSuffix(a AST) AST {
  	i := 0
  	if len(st.str) > 1 && st.str[0] == '.' && (isLower(st.str[1]) || st.str[1] == '_') {
  		i += 2
  		for len(st.str) > i && (isLower(st.str[i]) || st.str[i] == '_') {
  			i++
  		}
  	}
  	for len(st.str) > i+1 && st.str[i] == '.' && isDigit(st.str[i+1]) {
  		i += 2
  		for len(st.str) > i && isDigit(st.str[i]) {
  			i++
  		}
  	}
  	suffix := st.str[:i]
  	st.advance(i)
  	return &Clone{Base: a, Suffix: suffix}
  }
docs: // Recognize a clone suffix.  These are not part of the mangling API,
  // but are added by GCC when cloning functions.