error[E0366]: `Drop` impls cannot be specialized
  --> $DIR/issue-38868.rs:5:1
   |
LL | impl Drop for List<i32> {
   | ^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: `i32` is not a generic parameter
note: use the same sequence of generic lifetime, type and const parameters as the struct definition
  --> $DIR/issue-38868.rs:1:1
   |
LL | pub struct List<T> {
   | ^^^^^^^^^^^^^^^^^^

error: aborting due to previous error

For more information about this error, try `rustc --explain E0366`.