error: lifetime must precede `mut`
  --> $DIR/issue-73568-lifetime-after-mut.rs:2:13
   |
LL | fn x<'a>(x: &mut 'a i32){}
   |             ^^^^^^^ help: place the lifetime before `mut`: `&'a mut`

error[E0178]: expected a path on the left-hand side of `+`, not `&mut 'a`
  --> $DIR/issue-73568-lifetime-after-mut.rs:14:13
   |
LL | fn y<'a>(y: &mut 'a + Send) {
   |             ^^^^^^^^^^^^^^ help: try adding parentheses: `&mut ('a + Send)`

error: lifetime must precede `mut`
  --> $DIR/issue-73568-lifetime-after-mut.rs:6:22
   |
LL |         fn w<$lt>(w: &mut $lt i32) {}
   |                      ^^^^^^^^ help: place the lifetime before `mut`: `&$lt mut`
...
LL | mac!('a);
   | -------- in this macro invocation
   |
   = note: this error originates in the macro `mac` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0423]: expected value, found trait `Send`
  --> $DIR/issue-73568-lifetime-after-mut.rs:19:28
   |
LL |     let z = y as &mut 'a + Send;
   |                            ^^^^ not a value

warning: trait objects without an explicit `dyn` are deprecated
  --> $DIR/issue-73568-lifetime-after-mut.rs:14:18
   |
LL | fn y<'a>(y: &mut 'a + Send) {
   |                  ^^ help: use `dyn`: `dyn 'a`
   |
   = note: `#[warn(bare_trait_objects)]` on by default
   = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>

warning: trait objects without an explicit `dyn` are deprecated
  --> $DIR/issue-73568-lifetime-after-mut.rs:19:23
   |
LL |     let z = y as &mut 'a + Send;
   |                       ^^ help: use `dyn`: `dyn 'a`
   |
   = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>

error[E0224]: at least one trait is required for an object type
  --> $DIR/issue-73568-lifetime-after-mut.rs:14:18
   |
LL | fn y<'a>(y: &mut 'a + Send) {
   |                  ^^

error: aborting due to 5 previous errors; 2 warnings emitted

Some errors have detailed explanations: E0178, E0224, E0423.
For more information about an error, try `rustc --explain E0178`.