New upstream version 1.74.1+dfsg1

[rustc.git] / src / tools / clippy / tests / ui / transmute_ptr_to_ref.fixed

#![warn(clippy::transmute_ptr_to_ref)]
#![allow(clippy::match_single_binding, clippy::unnecessary_cast)]

unsafe fn _ptr_to_ref<T, U>(p: *const T, m: *mut T, o: *const U, om: *mut U) {
    let _: &T = &*p;
    let _: &T = &*p;

    let _: &mut T = &mut *m;
    let _: &mut T = &mut *m;

    let _: &T = &*m;
    let _: &T = &*m;

    let _: &mut T = &mut *(p as *mut T);
    let _ = &mut *(p as *mut T);

    let _: &T = &*(o as *const T);
    let _: &T = &*(o as *const T);

    let _: &mut T = &mut *(om as *mut T);
    let _: &mut T = &mut *(om as *mut T);

    let _: &T = &*(om as *const T);
    let _: &T = &*(om as *const T);
}

fn _issue1231() {
    struct Foo<'a, T> {
        bar: &'a T,
    }

    let raw = 42 as *const i32;
    let _: &Foo<u8> = unsafe { &*raw.cast::<Foo<_>>() };

    let _: &Foo<&u8> = unsafe { &*raw.cast::<Foo<&_>>() };

    type Bar<'a> = &'a u8;
    let raw = 42 as *const i32;
    unsafe { &*(raw as *const u8) };
}

unsafe fn _issue8924<'a, 'b, 'c>(x: *const &'a u32, y: *const &'b u32) -> &'c &'b u32 {
    match 0 {
        0 => &*x.cast::<&u32>(),
        1 => &*y.cast::<&u32>(),
        2 => &*x.cast::<&'b u32>(),
        _ => &*y.cast::<&'b u32>(),
    }
}

#[clippy::msrv = "1.38"]
unsafe fn _meets_msrv<'a, 'b, 'c>(x: *const &'a u32) -> &'c &'b u32 {
    let a = 0u32;
    let a = &a as *const u32;
    let _: &u32 = &*a;
    let _: &u32 = &*a.cast::<u32>();
    match 0 {
        0 => &*x.cast::<&u32>(),
        _ => &*x.cast::<&'b u32>(),
    }
}

#[clippy::msrv = "1.37"]
unsafe fn _under_msrv<'a, 'b, 'c>(x: *const &'a u32) -> &'c &'b u32 {
    let a = 0u32;
    let a = &a as *const u32;
    let _: &u32 = &*a;
    let _: &u32 = &*(a as *const u32);
    match 0 {
        0 => &*(x as *const () as *const &u32),
        _ => &*(x as *const () as *const &'b u32),
    }
}

fn main() {}