error[E0658]: `catch` expression is experimental (see issue #31436)
  --> $DIR/feature-gate-catch_expr.rs:12:24
   |
12 |       let catch_result = do catch { //~ ERROR `catch` expression is experimental
   |  ________________________^
13 | |         let x = 5;
14 | |         x
15 | |     };
   | |_____^
   |
   = help: add #![feature(catch_expr)] to the crate attributes to enable

error: aborting due to previous error