error: `#[panic_implementation]` function should have no type parameters
  --> $DIR/panic-implementation-bad-signature-4.rs:20:1
   |
LL | / fn panic<T>(pi: &PanicInfo) -> ! {
LL | |     //~^ ERROR `#[panic_implementation]` function should have no type parameters
LL | |     loop {}
LL | | }
   | |_^

error: aborting due to previous error