warning: function pointers are not nullable, so checking them for null will always return false
  --> $DIR/fn_null_check.rs:6:8
   |
LL |     if (fn_ptr as *mut ()).is_null() {}
   |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: wrap the function pointer inside an `Option` and use `Option::is_none` to check for null pointer value
   = note: `#[warn(incorrect_fn_null_checks)]` on by default

warning: function pointers are not nullable, so checking them for null will always return false
  --> $DIR/fn_null_check.rs:8:8
   |
LL |     if (fn_ptr as *const u8).is_null() {}
   |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: wrap the function pointer inside an `Option` and use `Option::is_none` to check for null pointer value

warning: function pointers are not nullable, so checking them for null will always return false
  --> $DIR/fn_null_check.rs:10:8
   |
LL |     if (fn_ptr as *const ()) == std::ptr::null() {}
   |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: wrap the function pointer inside an `Option` and use `Option::is_none` to check for null pointer value

warning: function pointers are not nullable, so checking them for null will always return false
  --> $DIR/fn_null_check.rs:12:8
   |
LL |     if (fn_ptr as *mut ()) == std::ptr::null_mut() {}
   |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: wrap the function pointer inside an `Option` and use `Option::is_none` to check for null pointer value

warning: function pointers are not nullable, so checking them for null will always return false
  --> $DIR/fn_null_check.rs:14:8
   |
LL |     if (fn_ptr as *const ()) == (0 as *const ()) {}
   |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: wrap the function pointer inside an `Option` and use `Option::is_none` to check for null pointer value

warning: function pointers are not nullable, so checking them for null will always return false
  --> $DIR/fn_null_check.rs:16:8
   |
LL |     if <*const _>::is_null(fn_ptr as *const ()) {}
   |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: wrap the function pointer inside an `Option` and use `Option::is_none` to check for null pointer value

warning: function pointers are not nullable, so checking them for null will always return false
  --> $DIR/fn_null_check.rs:18:8
   |
LL |     if (fn_ptr as *mut fn() as *const fn() as *const ()).is_null() {}
   |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: wrap the function pointer inside an `Option` and use `Option::is_none` to check for null pointer value

warning: function pointers are not nullable, so checking them for null will always return false
  --> $DIR/fn_null_check.rs:20:8
   |
LL |     if (fn_ptr as fn() as *const ()).is_null() {}
   |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: wrap the function pointer inside an `Option` and use `Option::is_none` to check for null pointer value

warning: 8 warnings emitted