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error[E0005]: refutable pattern in local binding
  --> $DIR/feature-gate-exhaustive-patterns.rs:8:9
   |
LL |     let Ok(_x) = &foo();
   |         ^^^^^^ pattern `&Err(_)` not covered
   |
   = note: `let` bindings require an "irrefutable pattern", like a `struct` or an `enum` with only one variant
   = note: for more information, visit https://doc.rust-lang.org/book/ch19-02-refutability.html
   = note: the matched value is of type `&Result<u32, !>`
help: you might want to use `let else` to handle the variant that isn't matched
   |
LL |     let Ok(_x) = &foo() else { todo!() };
   |                         ++++++++++++++++

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0005`.