unsafe: Bad diagnostic message

[b-NC]

Given the following code:

pub extern "C" unsafe fn test() {}

The current output is:

error: expected `{`, found keyword `unsafe`
  --> tests/syscalls.rs:14:16
   |
14 | pub extern "C" unsafe fn test() {}
   |                ^^^^^^ expected `{`

Ideally the output should look like:

error: wrongfully placed unsafe keyword
  --> tests/syscalls.rs:14:16
   |
14 | pub extern "C" unsafe fn test() {}
   |                ^^^^ "Move after access specifier"

[terrarier2111]

@rustbot claim