::= | | | | | | | | | ::= ( | | | | | | | | | ) ::= ".set(" ")" ";" ::= "(" ")" "{" * "}" ( "(" ")" "{" * "}" )? ( "{" * "}" )? ::= "(" ")" "{" * "}" ::= "(" "," "->" ("," )? ")" "{" * "}" ::= "(" "," "->" ("," )? ")" "{" * "}" ::= "(" ? ")" ";" ::= ";" ::= ".set(" ")" "{" * "}" ::= ".attempt" "{" * "}" ::= ("ok" | | "error") "{" * "}" ::= "." "(" ("(" ? ")")? ")" ";"