| error[E0658]: use of unstable library feature 'trace_macros': `trace_macros` is not stable enough for use and is subject to change |
| --> $DIR/feature-gate-trace_macros.rs:2:5 |
| | |
| LL | trace_macros!(true); |
| | ^^^^^^^^^^^^ |
| | |
| = note: see issue #29598 <https://github.com/rust-lang/rust/issues/29598> for more information |
| = help: add `#![feature(trace_macros)]` to the crate attributes to enable |
| = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date |
| |
| error: aborting due to 1 previous error |
| |
| For more information about this error, try `rustc --explain E0658`. |
