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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:1:5:
              1| let or = 1; in or
               |     ^
              2|
error: syntax error, expecting expression
       at /pwd/in.nix:1:16:
            1| let or = 1; in or
             |                ^
            2|