tests/ui/check-cfg/invalid-arguments.cfg_none.stderr

error: invalid `--check-cfg` argument: `cfg(none())`
   |
   = note: `none()` is invalid
   = note: `cfg()` arguments must be simple identifiers, `any()` or `values(...)`
   = note: visit <https://doc.rust-lang.org/nightly/rustc/check-cfg.html> for more details