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Named functions

Functions can now be "named":

```
f my_func(x) {
  return x**2
}
```

Earlier, you would have had to assign
the function to a variable:

```
my_func = f(x) {
  return x**2
}
```

while right now function names are first-class
citizens. For example, the string representation
of a function will actualy include its name (to be
included in stacktraces as well):

```
⧐  f test() {echo(1)}
f test() {echo(1)}
```

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