error[E0277]: `?` couldn't convert the error to `ApplicationError`
  --> $DIR/suggest-complex-bound-on-method.rs:18:16
   |
LL |         t.run()?;
   |           -----^ the trait `From<<T as Trait>::Error>` is not implemented for `ApplicationError`
   |           |
   |           this can't be annotated with `?` because it has type `Result<_, <T as Trait>::Error>`
   |
note: `ApplicationError` needs to implement `From<<T as Trait>::Error>`
  --> $DIR/suggest-complex-bound-on-method.rs:12:1
   |
LL | enum ApplicationError {
   | ^^^^^^^^^^^^^^^^^^^^^
   = note: the question mark operation (`?`) implicitly performs a conversion on the error value using the `From` trait
help: consider introducing a `where` clause, but there might be an alternative better way to express this requirement
   |
LL |     fn thing<T: Trait>(&self, t: T) -> Result<(), ApplicationError> where ApplicationError: From<<T as Trait>::Error> {
   |                                                                     +++++++++++++++++++++++++++++++++++++++++++++++++

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0277`.