error[E0412]: cannot find type `T` in this scope
  --> $DIR/autoderef-with-param-env-error.rs:3:5
   |
LL |     T: Send,
   |     ^ not found in this scope
   |
help: you might be missing a type parameter
   |
LL | fn foo<T>()
   |       +++

error: aborting due to previous error

For more information about this error, try `rustc --explain E0412`.