Feat: Support function name list in ->

[kilianmh]

• Add support for multiple function names when declaring types with ->
• Add unit tests for one and multiple functions names

[ruricolist]

There's a deeper issue here: this would mean it's no longer possible to use -> to declare ftypes for setf functions.

[ruricolist]

One approach might be to dispatch on whether the first element of the list is a symbol in the :cl package; if so treat it as a function name that's a list; otherwise treat it as a list of function names.

[kilianmh]

Sure we can test whether its part of the cl package. Alternatively, if setf is the only special case, we could check if the first element is the setf symbol.

[kilianmh]

I added now the check whether the first symbol is in the cl package. Now setf should work. Also there are more test-cases. Anything else needs to change?

[ruricolist]

Merged, thanks!