error[E0005]: refutable pattern in local binding: `T(_, _)` not covered
--> $DIR/empty-never-array.rs:10:9
|
-LL | / enum Helper<T, U> {
-LL | | T(T, [!; 0]),
- | | - not covered
-LL | | #[allow(dead_code)]
-LL | | U(U),
-LL | | }
- | |_- `Helper<T, U>` defined here
-...
-LL | let Helper::U(u) = Helper::T(t, []);
- | ^^^^^^^^^^^^ pattern `T(_, _)` not covered
+LL | let Helper::U(u) = Helper::T(t, []);
+ | ^^^^^^^^^^^^ pattern `T(_, _)` 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: `Helper<T, U>` defined here
+ --> $DIR/empty-never-array.rs:4:5
+ |
+LL | enum Helper<T, U> {
+ | ------
+LL | T(T, [!; 0]),
+ | ^ not covered
= note: the matched value is of type `Helper<T, U>`
help: you might want to use `if let` to ignore the variant that isn't matched
|
-LL | if let Helper::U(u) = Helper::T(t, []) { /* */ }
+LL | let u = if let Helper::U(u) = Helper::T(t, []) { u } else { todo!() };
+ | ++++++++++ ++++++++++++++++++++++
+help: alternatively, on nightly, you might want to use `#![feature(let_else)]` to handle the variant that isn't matched
|
+LL | let Helper::U(u) = Helper::T(t, []) else { todo!() };
+ | ++++++++++++++++
error: aborting due to previous error