error: unused variable: `a`
  --> $DIR/lint-unused-variables.rs:7:5
   |
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:4:9
   |
LL | #![deny(unused_variables)]
   |         ^^^^^^^^^^^^^^^^

error: unused variable: `a`
  --> $DIR/lint-unused-variables.rs:21:9
   |
LL |         a: i32,
   |         ^ help: if this is intentional, prefix it with an underscore: `_a`

error: unused variable: `a`
  --> $DIR/lint-unused-variables.rs:67:9
   |
LL |         a: i32,
   |         ^ help: if this is intentional, prefix it with an underscore: `_a`

error: unused variable: `b`
  --> $DIR/lint-unused-variables.rs:13:5
   |
LL |     b: i32,
   |     ^ help: if this is intentional, prefix it with an underscore: `_b`

error: unused variable: `b`
  --> $DIR/lint-unused-variables.rs:28:9
   |
LL |         b: i32,
   |         ^ help: if this is intentional, prefix it with an underscore: `_b`

error: unused variable: `b`
  --> $DIR/lint-unused-variables.rs:33:9
   |
LL |         b: i32,
   |         ^ help: if this is intentional, prefix it with an underscore: `_b`

error: unused variable: `b`
  --> $DIR/lint-unused-variables.rs:41:9
   |
LL |         b: i32,
   |         ^ help: if this is intentional, prefix it with an underscore: `_b`

error: unused variable: `b`
  --> $DIR/lint-unused-variables.rs:46:9
   |
LL |         b: i32,
   |         ^ help: if this is intentional, prefix it with an underscore: `_b`

error: unused variable: `b`
  --> $DIR/lint-unused-variables.rs:54:9
   |
LL |         b: i32,
   |         ^ help: if this is intentional, prefix it with an underscore: `_b`

error: unused variable: `b`
  --> $DIR/lint-unused-variables.rs:59:9
   |
LL |         b: i32,
   |         ^ help: if this is intentional, prefix it with an underscore: `_b`

error: unused variable: `b`
  --> $DIR/lint-unused-variables.rs:73:9
   |
LL |         b: i32,
   |         ^ help: if this is intentional, prefix it with an underscore: `_b`

error: aborting due to 11 previous errors