warning: function cannot return without recursing
  --> $DIR/recursive.rs:3:1
   |
LL | const fn f<T>(x: T) {
   | ^^^^^^^^^^^^^^^^^^^ cannot return without recursing
LL |     f(x);
   |     ---- recursive call site
   |
   = help: a `loop` may express intention better if this is on purpose
   = note: `#[warn(unconditional_recursion)]` on by default

error[E0080]: evaluation of constant value failed
  --> $DIR/recursive.rs:4:5
   |
LL |     f(x);
   |     ^^^^ reached the configured maximum number of stack frames
   |
note: inside `f::<i32>`
  --> $DIR/recursive.rs:4:5
   |
LL |     f(x);
   |     ^^^^
note: [... 126 additional calls inside `f::<i32>` ...]
  --> $DIR/recursive.rs:4:5
   |
LL |     f(x);
   |     ^^^^
note: inside `X`
  --> $DIR/recursive.rs:8:15
   |
LL | const X: () = f(1);
   |               ^^^^

error: aborting due to previous error; 1 warning emitted

For more information about this error, try `rustc --explain E0080`.