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

error: unused variable: `a`
  --> $DIR/lint-unused-variables.rs:22:9
   |
LL |         a: i32,
   |         ^ help: if this is intentional, prefix it with an underscore: `_a`

error: unused variable: `a`
  --> $DIR/lint-unused-variables.rs:68:9
   |
LL |         a: i32,
   |         ^ help: if this is intentional, prefix it with an underscore: `_a`

error: unused variable: `b`
  --> $DIR/lint-unused-variables.rs:14:5
   |
LL |     b: i32,
   |     ^ help: if this is intentional, prefix it with an underscore: `_b`

error: unused variable: `b`
  --> $DIR/lint-unused-variables.rs:29:9
   |
LL |         b: i32,
   |         ^ help: if this is intentional, prefix it with an underscore: `_b`

error: unused variable: `b`
  --> $DIR/lint-unused-variables.rs:34:9
   |
LL |         b: i32,
   |         ^ help: if this is intentional, prefix it with an underscore: `_b`

error: unused variable: `b`
  --> $DIR/lint-unused-variables.rs:42:9
   |
LL |         b: i32,
   |         ^ help: if this is intentional, prefix it with an underscore: `_b`

error: unused variable: `b`
  --> $DIR/lint-unused-variables.rs:47:9
   |
LL |         b: i32,
   |         ^ help: if this is intentional, prefix it with an underscore: `_b`

error: unused variable: `b`
  --> $DIR/lint-unused-variables.rs:55:9
   |
LL |         b: i32,
   |         ^ help: if this is intentional, prefix it with an underscore: `_b`

error: unused variable: `b`
  --> $DIR/lint-unused-variables.rs:60:9
   |
LL |         b: i32,
   |         ^ help: if this is intentional, prefix it with an underscore: `_b`

error: unused variable: `b`
  --> $DIR/lint-unused-variables.rs:74:9
   |
LL |         b: i32,
   |         ^ help: if this is intentional, prefix it with an underscore: `_b`

error: aborting due to 11 previous errors