Commits on Sep 30, 2019

1. async/await: improve obligation errors …

   This commit improves obligation errors for async/await:
   
   ```
   note: future does not implement `std::marker::Send` because this value is used across an
         await
     --> $DIR/issue-64130-non-send-future-diags.rs:15:5
      |
   LL |     let g = x.lock().unwrap();
      |         - has type `std::sync::MutexGuard<'_, u32>`
   LL |     baz().await;
      |     ^^^^^^^^^^^ await occurs here, with `g` maybe used later
   LL | }
      | - `g` is later dropped here
   ```
   
   Signed-off-by: David Wood <david@davidtw.co>

   

   davidtwco committed Sep 30, 2019
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