error:
       … while evaluating a path segment
         at /pwd/lang/eval-fail-nested-list-items.nix:12:3:
           11| ""
           12| + (
             |   ^
           13|   let

       error: cannot coerce a list to a string: [ [ 1 2 3 4 5 6 7 8 ] [ 1 «3 items elided» ] ]
