Macro debris_llir::function_interface::impl_to_function_interface

macro_rules! impl_to_function_interface {
    ($($xs:ident),*) => { ... };
    (impl_inner, [$($xs:ident),*], $($use_ctx:tt)?) => { ... };
    (maybe_promote, $ctx:expr, $val:expr, $typ:ident) => { ... };
    (verify_type, $val:expr, $typ:ident) => { ... };
}

Implements the ToFunctionInterface trait for functions with a variable amount of parameters