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warning: using or as an identifier is deprecated because it cannot be used in most places (try let or = 1; in or). Use --extra-deprecated-features or-as-identifier to disable this warning.
         at /pwd/in.nix:6:3:
              5|   bs = { f-o-o.bar = "foo"; };
              6|   or = x: y: x || y;
               |   ^
              7| in
warning: using or as an argument is deprecated because it is parsed with the wrong precedence which may cause unexpected behavior. Use --extra-deprecated-features or-as-identifier to disable this warning.
         at /pwd/in.nix:20:9:
             19|   # it short-circuits and never runs into the type error
             20|   (fold or [] [true false false])
               |         ^
             21| ]