error: const blocks cannot be used as patterns
  --> $DIR/in-pat-recovery.rs:6:15
   |
LL |         const { 1 + 7 } => {}
   |               ^^^^^^^^^
   |
   = help: use a named `const`-item or an `if`-guard (`x if x == const { ... }`) instead

error: aborting due to 1 previous error