Keywords.flex

"receive"    { yybegin(DECLARATION); return sym(Terminals.RECEIVE); }
"send"       { yybegin(DECLARATION); return sym(Terminals.SEND); }
"using"      { return sym(Terminals.USING); }
"canDependOn" { return sym(Terminals.CAN_DEPEND_ON); }
"maps"       { return sym(Terminals.MAPS); }
"to"         { return sym(Terminals.TO); }
"as"         { return sym(Terminals.AS); }