error[E0004]: non-exhaustive patterns: `Err(_)` not covered
  --> $DIR/uninhabited-matches-feature-gated.rs:6:19
   |
LL |     let _ = match x {
   |                   ^ pattern `Err(_)` not covered
   | 
  ::: $SRC_DIR/core/src/result.rs:LL:COL
   |
LL |     Err(#[stable(feature = "rust1", since = "1.0.0")] E),
   |     --- not covered
   |
   = help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
   = note: the matched value is of type `Result<u32, &Void>`

error[E0004]: non-exhaustive patterns: type `&Void` is non-empty
  --> $DIR/uninhabited-matches-feature-gated.rs:15:19
   |
LL | enum Void {}
   | ------------ `Void` defined here
...
LL |     let _ = match x {};
   |                   ^
   |
   = help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
   = note: the matched value is of type `&Void`
   = note: references are always considered inhabited

error[E0004]: non-exhaustive patterns: type `(Void,)` is non-empty
  --> $DIR/uninhabited-matches-feature-gated.rs:18:19
   |
LL |     let _ = match x {};
   |                   ^
   |
   = help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
   = note: the matched value is of type `(Void,)`

error[E0004]: non-exhaustive patterns: type `[Void; 1]` is non-empty
  --> $DIR/uninhabited-matches-feature-gated.rs:21:19
   |
LL |     let _ = match x {};
   |                   ^
   |
   = help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
   = note: the matched value is of type `[Void; 1]`

error[E0004]: non-exhaustive patterns: `&[_, ..]` not covered
  --> $DIR/uninhabited-matches-feature-gated.rs:24:19
   |
LL |     let _ = match x {
   |                   ^ pattern `&[_, ..]` not covered
   |
   = help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
   = note: the matched value is of type `&[Void]`

error[E0004]: non-exhaustive patterns: `Err(_)` not covered
  --> $DIR/uninhabited-matches-feature-gated.rs:32:19
   |
LL |     let _ = match x {
   |                   ^ pattern `Err(_)` not covered
   | 
  ::: $SRC_DIR/core/src/result.rs:LL:COL
   |
LL |     Err(#[stable(feature = "rust1", since = "1.0.0")] E),
   |     --- not covered
   |
   = help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
   = note: the matched value is of type `Result<u32, Void>`

error[E0005]: refutable pattern in local binding: `Err(_)` not covered
  --> $DIR/uninhabited-matches-feature-gated.rs:37:9
   |
LL |     let Ok(x) = x;
   |         ^^^^^ pattern `Err(_)` not covered
   | 
  ::: $SRC_DIR/core/src/result.rs:LL:COL
   |
LL |     Err(#[stable(feature = "rust1", since = "1.0.0")] E),
   |     --- 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: the matched value is of type `Result<u32, Void>`
help: you might want to use `if let` to ignore the variant that isn't matched
   |
LL |     if let Ok(x) = x { /* */ }
   |

error: aborting due to 7 previous errors

Some errors have detailed explanations: E0004, E0005.
For more information about an error, try `rustc --explain E0004`.