error[E0277]: the trait bound `Params: Plugin<i32>` is not satisfied
  --> $DIR/issue-45801.rs:21:9
   |
LL |     req.get_ref::<Params>();
   |         ^^^^^^^ the trait `Plugin<i32>` is not implemented for `Params`
   |
   = help: the following implementations were found:
             <Params as Plugin<Foo>>

error: aborting due to previous error

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