Usage of unsafe methods in safe code doesn't cause an error.

[brendanzab]

This complies ok:

struct A(int);

impl A {
    unsafe fn a(&self) -> int { **self }
}

trait B {
    unsafe fn b(&self) -> int;
}

impl B for A {
    unsafe fn b(&self) -> int { **self }
}

fn main() {
    let _ = A(1).a();
    let _ = A(1).b();

    unsafe {
        let _ = A(1).a();
        let _ = A(1).b();
    }
}

With this warning:

unsafe-methods.rs:19:4: 22:5 warning: unnecessary `unsafe` block [-W unused-unsafe (default)]
unsafe-methods.rs:19     unsafe {
unsafe-methods.rs:20         let _ = A(1).a();
unsafe-methods.rs:21         let _ = A(1).b();
unsafe-methods.rs:22     }

Yikes.

[brendanzab]

Woops, this is a duplicate of #3080