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error:
       … while calling the 'deepSeq' builtin
         at /pwd/in.nix:1:1:
            1| builtins.deepSeq { x = abort "foo"; } 456
             | ^
            2|

       … while evaluating the attribute 'x'
         at /pwd/in.nix:1:20:
            1| builtins.deepSeq { x = abort "foo"; } 456
             |                    ^
            2|

       … while calling the 'abort' builtin
         at /pwd/in.nix:1:24:
            1| builtins.deepSeq { x = abort "foo"; } 456
             |                        ^
            2|

       error: evaluation aborted with the following error message: 'foo'