| error: invalid `--check-cfg` argument: `cfg(true)` | |
| | | |
| = note: `true` is a boolean literal | |
| = 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 | |