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error[E0720]: cannot resolve opaque type
  --> $DIR/recursive-generator.rs:5:13
   |
LL |   fn foo() -> impl Generator<Yield = (), Return = ()> {
   |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ recursive opaque type
...
LL | /     || {
LL | |
LL | |         let mut gen = Box::pin(foo());
   | |             ------- generator captures itself here
LL | |
...  |
LL | |         }
LL | |     }
   | |_____- returning here with type `[generator@$DIR/recursive-generator.rs:9:5: 9:7]`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0720`.