error: constant item is never used: `foo`
  --> $DIR/issue-17718-const-naming.rs:4:1
   |
LL | const foo: isize = 3;
   | ^^^^^^^^^^^^^^^^^^^^^
   |
note: lint level defined here
  --> $DIR/issue-17718-const-naming.rs:2:9
   |
LL | #![deny(warnings)]
   |         ^^^^^^^^
   = note: #[deny(dead_code)] implied by #[deny(warnings)]

error: constant `foo` should have an upper case name
  --> $DIR/issue-17718-const-naming.rs:4:7
   |
LL | const foo: isize = 3;
   |       ^^^ help: convert the identifier to upper case: `FOO`
   |
note: lint level defined here
  --> $DIR/issue-17718-const-naming.rs:2:9
   |
LL | #![deny(warnings)]
   |         ^^^^^^^^
   = note: #[deny(non_upper_case_globals)] implied by #[deny(warnings)]

error: aborting due to 2 previous errors