error[E0277]: can't compare `&T` with `T`
  --> $DIR/partialeq_help.rs:2:7
   |
LL |     a == b;
   |       ^^ no implementation for `&T == T`
   |
   = help: the trait `PartialEq<T>` is not implemented for `&T`
help: consider introducing a `where` bound, but there might be an alternative better way to express this requirement
   |
LL | fn foo<T: PartialEq>(a: &T, b: T) where &T: PartialEq<T> {
   |                                   ^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to previous error

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