error[E0005]: refutable pattern in local binding --> $DIR/issue-31561.rs:8:9 | LL | let Thing::Foo(y) = Thing::Foo(1); | ^^^^^^^^^^^^^ patterns `Thing::Bar` and `Thing::Baz` 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/ch18-02-refutability.html note: `Thing` defined here --> $DIR/issue-31561.rs:1:6 | LL | enum Thing { | ^^^^^ LL | Foo(u8), LL | Bar, | --- not covered LL | Baz | --- not covered = note: the matched value is of type `Thing` help: you might want to use `let else` to handle the variants that aren't matched | LL | let Thing::Foo(y) = Thing::Foo(1) else { todo!() }; | ++++++++++++++++ error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0005`.