error[E0597]: `l` does not live long enough
  --> $DIR/span-semicolon-issue-139049.rs:11:41
   |
LL | macro_rules! perform { ($e:expr) => { D(&$e).end() } }
   |                                       --^^^-
   |                                       | |
   |                                       | borrowed value does not live long enough
   |                                       a temporary with access to the borrow is created here ...
...
LL |     { let l = (); perform!(l) };
   |           -       ----------- -- ... and the borrow might be used here, when that temporary is dropped and runs the `Drop` code for type `D`
   |           |       |           |
   |           |       |           `l` dropped here while still borrowed
   |           |       in this macro invocation
   |           binding `l` declared here
   |
   = note: this error originates in the macro `perform` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider adding semicolon after the expression so its temporaries are dropped sooner, before the local variables declared by the block are dropped
   |
LL |     { let l = (); perform!(l); };
   |                              +

error[E0597]: `l` does not live long enough
  --> $DIR/span-semicolon-issue-139049.rs:11:41
   |
LL | macro_rules! perform { ($e:expr) => { D(&$e).end() } }
   |                                       --^^^-
   |                                       | |
   |                                       | borrowed value does not live long enough
   |                                       a temporary with access to the borrow is created here ...
...
LL |     let _x = { let l = (); perform!(l) };
   |                    -       ----------- -- ... and the borrow might be used here, when that temporary is dropped and runs the `Drop` code for type `D`
   |                    |       |           |
   |                    |       |           `l` dropped here while still borrowed
   |                    |       in this macro invocation
   |                    binding `l` declared here
   |
   = note: the temporary is part of an expression at the end of a block;
           consider forcing this temporary to be dropped sooner, before the block's local variables are dropped
   = note: this error originates in the macro `perform` (in Nightly builds, run with -Z macro-backtrace for more info)
help: for example, you could save the expression's value in a new local variable `x` and then make `x` be the expression at the end of the block
   |
LL |     let _x = { let l = (); let x = perform!(l); x };
   |                            +++++++            +++

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0597`.