empty call

src/parser.y

@@ -83,7 +83,8 @@ expr:
     | expr MULTIPLY expr  { $$ = std::make_unique<BinOp>(
                                 BinaryOperator(BinaryOperator::MUL),
                                 std::move($1), std::move($3)); }
-    | L_PAREN expr R_PAREN {$$ = std::move($2);}
+    | L_PAREN expr R_PAREN {$$ = std::move($2); /* #todo: test for precedence*/}
+    | expr L_PAREN R_PAREN { $$ = std::make_unique<Call>(std::move($1), std::vector<std::unique_ptr<Expr>>());}
 
     ;