error[E0507]: cannot move out of `self.b`, as `self` is a captured variable in an `Fn` closure
  --> $DIR/issue-103624.rs:16:13
   |
LL |     async fn foo(&self) {
   |                  ----- captured outer variable
LL |         let bar = self.b.bar().await;
LL |         spawn_blocking(move || {
   |                        ------- captured by this `Fn` closure
LL |
LL |             self.b;
   |             ^^^^^^ move occurs because `self.b` has type `StructB`, which does not implement the `Copy` trait
   |
note: if `StructB` implemented `Clone`, you could clone the value
  --> $DIR/issue-103624.rs:23:1
   |
LL |             self.b;
   |             ------ you could clone this value
...
LL | struct StructB {}
   | ^^^^^^^^^^^^^^ consider implementing `Clone` for this type

error[E0521]: borrowed data escapes outside of method
  --> $DIR/issue-103624.rs:14:9
   |
LL |       async fn foo(&self) {
   |                    -----
   |                    |
   |                    `self` is a reference that is only valid in the method body
   |                    let's call the lifetime of this reference `'1`
LL |           let bar = self.b.bar().await;
LL | /         spawn_blocking(move || {
LL | |
LL | |             self.b;
LL | |
LL | |         })
   | |          ^
   | |          |
   | |__________`self` escapes the method body here
   |            argument requires that `'1` must outlive `'static`

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0507, E0521.
For more information about an error, try `rustc --explain E0507`.