warning: function cannot return without recursing
  --> $DIR/issue-85031-2.rs:12:5
   |
LL |     pub fn foo<const A: usize>() -> [(); A - 0] {
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot return without recursing
LL |         Self::foo()
   |         ----------- recursive call site
   |
   = help: a `loop` may express intention better if this is on purpose
   = note: `#[warn(unconditional_recursion)]` on by default

warning: 1 warning emitted