warning: function pointers and unsized pointers in patterns behave unpredictably and should not be relied upon. See https://github.com/rust-lang/rust/issues/70861 for details.
  --> $DIR/issue-63479-match-fnptr.rs:35:7
   |
LL |     B(TEST) => println!("matched"),
   |       ^^^^
   |
   = 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 #62411 <https://github.com/rust-lang/rust/issues/70861>
note: the lint level is defined here
  --> $DIR/issue-63479-match-fnptr.rs:8:9
   |
LL | #![warn(pointer_structural_match)]
   |         ^^^^^^^^^^^^^^^^^^^^^^^^

warning: 1 warning emitted