warning: floating-point types cannot be used in patterns
  --> $DIR/issue-86600-lint-twice.rs:10:9
   |
LL |         5.0 => {}
   |         ^^^
   |
   = 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

warning: 1 warning emitted