right now, code like
(lambda my-function [x unused-y]
(print x))
does not show any unused variables. This is because once the macros are expanded, fennel-ls sees that "unused-y" is in a non-nil assert.
To match the (case (p) [x unused-y] (print x)) behavior, I want to mark "unused-y" as unused, even though the assert is present.
One way to do this is by using compiler hooks to swap all lambda with fn, and then swap it back later.
Mirror image of issue fennel-ls#24
fixed