Commits on Feb 3, 2021

1. Remove incorrect delay_span_bug …

   The following code is supposed to compile
   
   ```rust
   use std::ops::BitOr;
   
   pub trait IntWrapper {
       type InternalStorage;
   }
   
   impl<T> BitOr for dyn IntWrapper<InternalStorage = T>
   where
       Self: Sized,
       T: BitOr + BitOr<Output = T>,
   {
       type Output = Self;
       fn bitor(self, _other: Self) -> Self {
           todo!()
       }
   }
   ```
   
   Before this change it would ICE. In rust-lang#70998 the removed logic was added
   to provide better suggestions, and the `delay_span_bug` guard was added
   to  protect against a potential logic error when returning traits. As it
   happens, there are cases, like the one above, where traits can indeed be
   returned, so valid code was being rejected.
   
   Fix rust-lang#80207.

   

   estebank committed Feb 3, 2021
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