1 error[E0658]: use of unstable library feature 'trace_macros': `trace_macros` is not stable enough for use and is subject to change
2 --> $DIR/feature-gate-trace_macros.rs:2:5
4 LL | trace_macros!(true);
7 = note: see issue #29598 <https://github.com/rust-lang/rust/issues/29598> for more information
8 = help: add `#![feature(trace_macros)]` to the crate attributes to enable
10 error: aborting due to previous error
12 For more information about this error, try `rustc --explain E0658`.