error: to use a constant of type `Foo` in a pattern, `Foo` must be annotated with `#[derive(PartialEq, Eq)]`
  --> $DIR/match-forbidden-without-eq.rs:11:9
   |
LL |         FOO => { }
   |         ^^^
   |
   = note: the traits must be derived, manual `impl`s are not sufficient
   = note: see https://doc.rust-lang.org/stable/std/marker/trait.StructuralEq.html for details

warning: floating-point types cannot be used in patterns
  --> $DIR/match-forbidden-without-eq.rs:18:9
   |
LL |         f32::INFINITY => { }
   |         ^^^^^^^^^^^^^
   |
   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
   = note: for more information, see issue #41620 <https://github.com/rust-lang/rust/issues/41620>
   = note: `#[warn(illegal_floating_point_literal_pattern)]` on by default

error: aborting due to previous error; 1 warning emitted