I am using a function with a lot of variables. There are 9 and sometimes more of them. In this case, it is difficult to memorize, which one stays on the, say, fourth position, and which one - on the seventh. I would like to be able to include the variable name into the square brackets of the function as a reminder: what must stay here.
For example, let us define a simple function: `f(x)=x^2+y^3`. Here is its definition:

```
f[x_,y_]:=x^2+y^3;

```

One can, however, call it with `x=5` and `y=7` as follows:

```
f[(*x=*)5,(*y=*)7]

```

This way reminds me of what should stay in the first and in the second position inside the square brackets.  

This works, but I do not like that it looks cumbersome. For perception, it would be much better, if the `(*` and `*)` signs are invisible.

Any idea?