warning: unused comparison that must be used
  --> $DIR/must-use-macros.rs:28:17
   |
LL |                 $a == $b
   |                 ^^^^^^^^ the comparison produces a value
...
LL |         cmp!(a, b);
   |         ---------- in this macro invocation
   |
note: the lint level is defined here
  --> $DIR/must-use-macros.rs:9:9
   |
LL | #![warn(unused_must_use)]
   |         ^^^^^^^^^^^^^^^
   = note: this warning originates in the macro `cmp` (in Nightly builds, run with -Z macro-backtrace for more info)
help: use `let _ = ...` to ignore the resulting value
   |
LL |         let _ = cmp!(a, b);
   |         +++++++

warning: unused comparison that must be used
  --> $DIR/must-use-macros.rs:41:17
   |
LL |                 $a == $b
   |                 ^^^^^^^^ the comparison produces a value
...
LL |         cmp!(1, 1);
   |         ---------- in this macro invocation
   |
   = note: this warning originates in the macro `cmp` (in Nightly builds, run with -Z macro-backtrace for more info)
help: use `let _ = ...` to ignore the resulting value
   |
LL |         let _ = cmp!(1, 1);
   |         +++++++

warning: unused return value of `std::cmp::PartialEq::eq` that must be used
  --> $DIR/must-use-macros.rs:56:9
   |
LL |         cmp!(1, 1);
   |         ^^^^^^^^^^
   |
help: use `let _ = ...` to ignore the resulting value
   |
LL |         let _ = cmp!(1, 1);
   |         +++++++

warning: 3 warnings emitted