function Missing(Symbol: SymbolType): integer;
  extern;

procedure AcceptSymbol;
  extern;

procedure Accept(SymbolExpected: SymbolType);
  extern;

procedure AcceptEquals;
  extern;

procedure CheckContext(ContextExpected: SetOfSymbols);
  extern;

procedure CheckNextOrContext(SymbolsExpected, DefaultContext:
                               SetOfSymbols);
  extern;

procedure SkipToContext(ContextNeeded: SetOfSymbols);
  extern;

procedure InitSyntax;
  extern;