1 error[E0658]: box pattern syntax is experimental (see issue #29641)
2 --> $DIR/feature-gate-box_patterns.rs:12:9
4 LL | let box x = Box::new('c'); //~ ERROR box pattern syntax is experimental
7 = help: add #![feature(box_patterns)] to the crate attributes to enable
9 error: aborting due to previous error
11 For more information about this error, try `rustc --explain E0658`.