error:
       … while calling the 'fromTOML' builtin

         at /pwd/lang/eval-fail-fromTOML-timestamps.nix:1:1:

            1| builtins.fromTOML ''
             | ^
            2|   key = "value"

       error: while parsing a TOML string: Dates and times are not supported

       at «none»:0: (source not available)