error: unconstrained opaque type
  --> $DIR/issue-86800.rs:31:34
   |
LL | type TransactionFuture<'__, O> = impl '__ + Future<Output = TransactionResult<O>>;
   |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
error: internal compiler error[E0792]: expected generic lifetime parameter, found `'_`
  --> $DIR/issue-86800.rs:39:5
   |
LL | type TransactionFuture<'__, O> = impl '__ + Future<Output = TransactionResult<O>>;
   |                        --- this generic parameter must be used with a generic lifetime parameter
...
LL |     f
   |     ^

error: the compiler unexpectedly panicked. this is a bug.

query stack during panic:
#0 [mir_borrowck] borrow-checking `execute_transaction_fut`
#1 [type_of_opaque] computing type of opaque `execute_transaction_fut::{opaque#0}`
end of query stack