fmap alias <~ is not working

[21it]

fmap alias <~ is not working:

iex(1)> use Witchcraft                                                             
Witchcraft.Comonad                                                                 
iex(2)> &(&1+1) <~ [1, 2, 3]                                                       
#Function<7.126501267/1 in :erl_eval.expr/5>

[asianfilm]

The following works, so perhaps it's only an issue with the shorthand form when using <~:

fn x -> x + 1 end <~ [1,2,3]

It's probably a separate issue, but I have had nested captures via & are not allowed errors whilst using Witchcraft when trying to chain (not nest) anonymous functions, which I've always resolved by using the fn ... end longhand form. Looking at the examples on various conference slides for the Witchcraft suite, I think this is a known issue and I assume it's to do with how it's shoehorned into Elixir.

[21it]

Actually additional brackets fix behaviour. But result of expression without brackets is completely unexpected. It should be compilation error in my opinion (if it can't be fixed).

iex(1)> use Witchcraft
Witchcraft.Comonad
iex(2)> &(&1+1) <~ [1, 2, 3]
#Function<7.126501267/1 in :erl_eval.expr/5>
iex(3)> (&(&1+1)) <~ [1, 2, 3]
[2, 3, 4]