error: macro rhs must be delimited
  --> $DIR/unused-macros-malformed-rule.rs:5:11
   |
LL |     () => 0;
   |           ^

error: macro rhs must be delimited
  --> $DIR/unused-macros-malformed-rule.rs:10:11
   |
LL |     () => 0;
   |           ^

error: unused macro definition: `foo`
  --> $DIR/unused-macros-malformed-rule.rs:3:14
   |
LL | macro_rules! foo {
   |              ^^^
   |
note: the lint level is defined here
  --> $DIR/unused-macros-malformed-rule.rs:1:9
   |
LL | #![deny(unused_macros)]
   |         ^^^^^^^^^^^^^

error: aborting due to 3 previous errors