| error: unexpected `--cfg fmt_debug="shallow"` flag | |
| | | |
| = note: config `fmt_debug` is only supposed to be controlled by `-Z fmt-debug` | |
| = note: manually setting a built-in cfg can and does create incoherent behaviors | |
| = note: `#[deny(explicit_builtin_cfgs_in_flags)]` on by default | |
| error: aborting due to 1 previous error | |