Unreachable code warning is not emitted if panic is called as a funcion

[malbarbo]

For this code

fn f(a) { a }

pub fn main() {
  f(panic())
}

the compiler emits the warning "Panic used as a function" but not "Unreachable code" for f.

[lpil]

Hello! Do you not think the existing warnings highlights that the code doesn't work?