error[E0658]: `log_syntax!` is not stable enough for use and is subject to change (see issue #29598)
  --> $DIR/feature-gate-log_syntax2.rs:14:20
   |
LL |     println!("{}", log_syntax!()); //~ ERROR `log_syntax!` is not stable
   |                    ^^^^^^^^^^^^^
   |
   = help: add #![feature(log_syntax)] to the crate attributes to enable

error: aborting due to previous error

For more information about this error, try `rustc --explain E0658`.