error: trait `Tr` is never used
  --> $DIR/unused-trait-with-assoc-const.rs:3:7
   |
LL | trait Tr {
   |       ^^
   |
note: the lint level is defined here
  --> $DIR/unused-trait-with-assoc-const.rs:1:9
   |
LL | #![deny(dead_code)]
   |         ^^^^^^^^^

error: struct `Foo` is never constructed
  --> $DIR/unused-trait-with-assoc-const.rs:7:8
   |
LL | struct Foo;
   |        ^^^

error: aborting due to 2 previous errors