code: func (r *importReader) readImport() {
  	c := r.peekByte(true)
  	if c == '.' {
  		r.peek = 0
  	} else if isIdent(c) {
  		r.readIdent()
  	}
  	r.readString()
  }
docs: // readImport reads an import clause - optional identifier followed by quoted string -
  // from the input.