Cannot compile rustc-ap-rustc_data_structures on nightly

[kvark]

error[E0061]: this function takes 1 argument but 0 arguments were supplied
  --> /Users/dmalyshau/.cargo/registry/src/git.luolix.top-1ecc6299db9ec823/rustc-ap-rustc_data_structures-637.0.0/box_region.rs:34:58
   |
34 |         let init = match Pin::new(&mut result.generator).resume() {
   |                                                          ^^^^^^- supplied 0 arguments
   |
help: expected the unit value `()`; create it with empty parentheses
   |
34 |         let init = match Pin::new(&mut result.generator).resume(()) {
   |                                                                 ^^

error[E0061]: this function takes 1 argument but 0 arguments were supplied
  --> /Users/dmalyshau/.cargo/registry/src/git.luolix.top-1ecc6299db9ec823/rustc-ap-rustc_data_structures-637.0.0/box_region.rs:48:76
   |
48 |         if let GeneratorState::Complete(_) = Pin::new(&mut self.generator).resume() {
   |                                                                            ^^^^^^- supplied 0 arguments
   |
help: expected the unit value `()`; create it with empty parentheses
   |
48 |         if let GeneratorState::Complete(_) = Pin::new(&mut self.generator).resume(()) {
   |                                                                                   ^^

error[E0061]: this function takes 1 argument but 0 arguments were supplied
  --> /Users/dmalyshau/.cargo/registry/src/git.luolix.top-1ecc6299db9ec823/rustc-ap-rustc_data_structures-637.0.0/box_region.rs:57:52
   |
57 |         let result = Pin::new(&mut self.generator).resume();
   |                                                    ^^^^^^- supplied 0 arguments
   |
help: expected the unit value `()`; create it with empty parentheses
   |
57 |         let result = Pin::new(&mut self.generator).resume(());
   |                                                           ^^

error: aborting due to 3 previous errors

For more information about this error, try `rustc --explain E0061`.
error: could not compile `rustc-ap-rustc_data_structures`.

[kvark]

Filed alexcrichton/rustc-auto-publish#21 upstream. Looks like we should be able to update to 656 once it's out.