error[E0308]: mismatched types
  --> tests/ui-nightly/try_transmute_ref-dst-mutable.rs:18:33
   |
18 |     let _: Result<&mut u8, _> = try_transmute_ref!(&0u8);
   |                                 ^^^^^^^^^^^^^^^^^^^^^^^^
   |                                 |
   |                                 types differ in mutability
   |                                 arguments to this enum variant are incorrect
   |
   = note: expected mutable reference `&mut u8`
                      found reference `&_`
help: the type constructed contains `&_` due to the type of the argument passed
  --> tests/ui-nightly/try_transmute_ref-dst-mutable.rs:18:33
   |
18 |     let _: Result<&mut u8, _> = try_transmute_ref!(&0u8);
   |                                 ^^^^^^^^^^^^^^^^^^^^^^^^ this argument influences the type of `Ok`
note: tuple variant defined here
  --> $RUST/core/src/result.rs
   |
   |     Ok(#[stable(feature = "rust1", since = "1.0.0")] T),
   |     ^^
   = note: this error originates in the macro `try_transmute_ref` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0308]: mismatched types
  --> tests/ui-nightly/try_transmute_ref-dst-mutable.rs:18:33
   |
18 |     let _: Result<&mut u8, _> = try_transmute_ref!(&0u8);
   |                                 ^^^^^^^^^^^^^^^^^^^^^^^^ types differ in mutability
   |
   = note: expected enum `Result<&mut u8, _>`
              found enum `Result<&_, ValidityError<&u8, _>>`
   = note: this error originates in the macro `try_transmute_ref` (in Nightly builds, run with -Z macro-backtrace for more info)