278 std::unique_ptr<T> ErrorU(const std::string &Str) {  in ErrorU()  function
314         return ErrorU<CallExprAST>("Expected ')' or ',' in argument list");  in ParseIdentifierExpr()
340     return ErrorU<ExprAST>("expected ')'");  in ParseParenExpr()
355     return ErrorU<ExprAST>("expected then");  in ParseIfExpr()
363     return ErrorU<ExprAST>("expected else");  in ParseIfExpr()
380     return ErrorU<ForExprAST>("expected identifier after for");  in ParseForExpr()
386     return ErrorU<ForExprAST>("expected '=' after for");  in ParseForExpr()
394     return ErrorU<ForExprAST>("expected ',' after for start value");  in ParseForExpr()
411     return ErrorU<ForExprAST>("expected 'in' after for");  in ParseForExpr()
431     return ErrorU<VarExprAST>("expected identifier after var");  in ParseVarExpr()
454       return ErrorU<VarExprAST>("expected identifier list after var");  in ParseVarExpr()
459     return ErrorU<VarExprAST>("expected 'in' keyword after 'var'");  in ParseVarExpr()
478   default: return ErrorU<ExprAST>("unknown token when expecting an expression");  in ParsePrimary()
563     return ErrorU<PrototypeAST>("Expected function name in prototype");  in ParsePrototype()
572       return ErrorU<PrototypeAST>("Expected unary operator");  in ParsePrototype()
581       return ErrorU<PrototypeAST>("Expected binary operator");  in ParsePrototype()
590         return ErrorU<PrototypeAST>("Invalid precedecnce: must be 1..100");  in ParsePrototype()
598     return ErrorU<PrototypeAST>("Expected '(' in prototype");  in ParsePrototype()
604     return ErrorU<PrototypeAST>("Expected ')' in prototype");  in ParsePrototype()
611     return ErrorU<PrototypeAST>("Invalid number of operands for operator");  in ParsePrototype()