error[E0277]: the trait bound `T: std::marker::Copy` is not satisfied
  --> $DIR/wf-in-fn-arg.rs:20:1
   |
LL | / fn bar<T>(_: &MustBeCopy<T>) //~ ERROR E0277
LL | | {
LL | | }
   | |_^ the trait `std::marker::Copy` is not implemented for `T`
   |
   = help: consider adding a `where T: std::marker::Copy` bound
note: required by `MustBeCopy`
  --> $DIR/wf-in-fn-arg.rs:16:1
   |
LL | struct MustBeCopy<T:Copy> {
   | ^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to previous error

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