error:
       … from call site
         at /pwd/lang/eval-fail-empty-formals.nix:1:1:
            1| (foo@{ }: 1) { a = 3; }
             | ^
            2|

       error: function 'anonymous lambda' called with unexpected argument 'a'
       at /pwd/lang/eval-fail-empty-formals.nix:1:2:
            1| (foo@{ }: 1) { a = 3; }
             |  ^
            2|