error[E0433]: failed to resolve: use of undeclared crate or module `assert_mem_uninitialized_valid`
  --> $DIR/rustc-error2.rs:LL:CC
   |
LL |     fn deref(&self) -> &assert_mem_uninitialized_valid::Target {
   |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ use of undeclared crate or module `assert_mem_uninitialized_valid`

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0433`.