error: unused variable: `a`
  --> $DIR/lint-unused-variables.rs:8:5
   |
LL |     a: i32,
   |     ^ help: consider prefixing with an underscore: `_a`
   |
note: lint level defined here
  --> $DIR/lint-unused-variables.rs:5:9
   |
LL | #![deny(unused_variables)]
   |         ^^^^^^^^^^^^^^^^

error: unused variable: `b`
  --> $DIR/lint-unused-variables.rs:14:5
   |
LL |     b: i32,
   |     ^ help: consider prefixing with an underscore: `_b`

error: unused variable: `a`
  --> $DIR/lint-unused-variables.rs:53:9
   |
LL |         a: i32,
   |         ^ help: consider prefixing with an underscore: `_a`

error: unused variable: `b`
  --> $DIR/lint-unused-variables.rs:59:9
   |
LL |         b: i32,
   |         ^ help: consider prefixing with an underscore: `_b`

error: unused variable: `b`
  --> $DIR/lint-unused-variables.rs:37:9
   |
LL |         b: i32,
   |         ^ help: consider prefixing with an underscore: `_b`

error: unused variable: `a`
  --> $DIR/lint-unused-variables.rs:22:9
   |
LL |         a: i32,
   |         ^ help: consider prefixing with an underscore: `_a`

error: unused variable: `b`
  --> $DIR/lint-unused-variables.rs:29:9
   |
LL |         b: i32,
   |         ^ help: consider prefixing with an underscore: `_b`

error: unused variable: `b`
  --> $DIR/lint-unused-variables.rs:45:9
   |
LL |         b: i32,
   |         ^ help: consider prefixing with an underscore: `_b`

error: aborting due to 8 previous errors