error[E0015]: cannot call non-const function `std::io::_print` in constant functions
  --> $DIR/issue-79450.rs:8:9
   |
LL |         println!("lul");
   |         ^^^^^^^^^^^^^^^
   |
note: function `_print` is not const
  --> $SRC_DIR/std/src/io/stdio.rs:LL:COL
   = note: calls in constant functions are limited to constant functions, tuple structs and tuple variants

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0015`.
