error[E0277]: `?` couldn't convert the error to `TryFromSliceError`
  --> $DIR/try-block-bad-type.rs:7:16
   |
LL |         Err("")?;
   |                ^ the trait `From<&str>` is not implemented for `TryFromSliceError`
   |
   = note: the question mark operation (`?`) implicitly performs a conversion on the error value using the `From` trait
   = help: the following implementations were found:
             <TryFromSliceError as From<Infallible>>
   = note: required because of the requirements on the impl of `FromResidual<Result<Infallible, &str>>` for `Result<u32, TryFromSliceError>`
note: required by `from_residual`
  --> $SRC_DIR/core/src/ops/try_trait.rs:LL:COL
   |
LL |     fn from_residual(residual: R) -> Self;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error[E0271]: type mismatch resolving `<Result<i32, i32> as Try>::Output == &str`
  --> $DIR/try-block-bad-type.rs:12:9
   |
LL |         ""
   |         ^^ expected `i32`, found `&str`

error[E0271]: type mismatch resolving `<Result<i32, i32> as Try>::Output == ()`
  --> $DIR/try-block-bad-type.rs:15:39
   |
LL |     let res: Result<i32, i32> = try { };
   |                                       ^ expected `i32`, found `()`

error[E0277]: a `try` block must return `Result` or `Option` (or another type that implements `Try`)
  --> $DIR/try-block-bad-type.rs:17:25
   |
LL |     let res: () = try { };
   |                         ^ could not wrap the final value of the block as `()` doesn't implement `Try`
   |
   = help: the trait `Try` is not implemented for `()`
note: required by `from_output`
  --> $SRC_DIR/core/src/ops/try_trait.rs:LL:COL
   |
LL |     fn from_output(output: Self::Output) -> Self;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error[E0277]: a `try` block must return `Result` or `Option` (or another type that implements `Try`)
  --> $DIR/try-block-bad-type.rs:20:26
   |
LL |     let res: i32 = try { 5 };
   |                          ^ could not wrap the final value of the block as `i32` doesn't implement `Try`
   |
   = help: the trait `Try` is not implemented for `i32`
note: required by `from_output`
  --> $SRC_DIR/core/src/ops/try_trait.rs:LL:COL
   |
LL |     fn from_output(output: Self::Output) -> Self;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to 5 previous errors

Some errors have detailed explanations: E0271, E0277.
For more information about an error, try `rustc --explain E0271`.