error: struct `T9` is never constructed
  --> $DIR/unconstructible-pub-struct.rs:30:12
   |
LL | pub struct T9<X> {
   |            ^^
   |
note: the lint level is defined here
  --> $DIR/unconstructible-pub-struct.rs:2:9
   |
LL | #![deny(dead_code)]
   |         ^^^^^^^^^

error: aborting due to 1 previous error