error:
       … while calling the 'fromTOML' builtin
         at /pwd/lang/eval-fail-fromTOML-underflow.nix:1:1:
            1| builtins.fromTOML ''attr = -9223372036854775809''
             | ^
            2|

       error: while parsing TOML: [error] toml::parse_dec_integer: too large integer: current max digits = 2^63
        --> fromTOML
          |
        1 | attr = -9223372036854775809
          |                            ^-- must be < 2^63
       
