$ RUST_BACKTRACE=full macchina
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: "Invalid variant: OperatingSystem
"', /home/xxx/.cargo/registry/src/github.com-1ecc6299db9ec823/macchina-6.1.7/src/data/mod.rs:142:61
stack backtrace:
   0:     0x5636dcf5d363 - std::backtrace_rs::backtrace::libunwind::trace::he615646ea344481f
                               at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/std/src/../../b
acktrace/src/backtrace/libunwind.rs:93:5
   1:     0x5636dcf5d363 - std::backtrace_rs::backtrace::trace_unsynchronized::h6ea8eaac68705b9c
                               at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/std/src/../../b
acktrace/src/backtrace/mod.rs:66:5
   2:     0x5636dcf5d363 - std::sys_common::backtrace::_print_fmt::h7ac486a935ce0bf7
                               at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/std/src/sys_com
mon/backtrace.rs:65:5
   3:     0x5636dcf5d363 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::
fmt::h1b5a095d3db2e28f
                               at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/std/src/sys_com
mon/backtrace.rs:44:22
   4:     0x5636dcf0613e - core::fmt::write::h445545b92224a1cd
                               at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/core/src/fmt/mo
d.rs:1209:17
   5:     0x5636dcf35c54 - std::io::Write::write_fmt::h55a43474c6520b00
                               at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/std/src/io/mod.
   6:     0x5636dcf5e327 - std::sys_common::backtrace::_print::h65d20526fdb736b0
                               at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/std/src/sys_com
   7:     0x5636dcf5e327 - std::sys_common::backtrace::print::h6555fbe12a1cc41b
                               at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/std/src/sys_com
   8:     0x5636dcf5e0c5 - std::panicking::default_hook::{{closure}}::hbdf58083140e7ac6
                               at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/std/src/panicki
   9:     0x5636dcf5e808 - std::panicking::default_hook::haef8271c56b74d85
                               at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/std/src/panicki
  10:     0x5636dcf5e808 - std::panicking::rust_panic_with_hook::hfd45b6b6c12d9fa5
                               at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/std/src/panicki
  11:     0x5636dcf5e4e2 - std::panicking::begin_panic_handler::{{closure}}::hf591e8609a75bd4b
                               at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/std/src/panicking.rs:579:13
  12:     0x5636dcf5e44c - std::sys_common::backtrace::__rust_end_short_backtrace::h81899558795e4ff7
                               at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/std/src/sys_common/backtrace.rs:137:18
  13:     0x5636dcf5e421 - rust_begin_unwind
                               at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/std/src/panicking.rs:575:5
  14:     0x5636dce587c2 - core::panicking::panic_fmt::h4235fa9b4675b332
                               at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/core/src/panicking.rs:65:14
  15:     0x5636dce58a62 - core::result::unwrap_failed::ha17dbf463031a5e1
                               at /rustc/69f9c33d71c871fc16ac445211281c6e7a340943/library/core/src/result.rs:1791:5
  16:     0x5636dce9e883 - macchina::main::hc584daf64627989b
  17:     0x5636dce60013 - std::sys_common::backtrace::__rust_begin_short_backtrace::hdfaa8f2d097002cf
  18:     0x5636dcec066e - main
  19:     0x7f60c65bc510 - __libc_start_call_main
  20:     0x7f60c65bc5c9 - __libc_start_main_alias_2
  21:     0x5636dce5dd45 - _start
  22:                0x0 - <unknown>