mirror of https://github.com/rust-lang/rust
537 lines
24 KiB
Plaintext
537 lines
24 KiB
Plaintext
error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
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--> $DIR/reference_casting.rs:17:16
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LL | let _num = &mut *(num as *const i32 as *mut i32);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
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= note: `#[deny(invalid_reference_casting)]` on by default
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error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
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--> $DIR/reference_casting.rs:19:16
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LL | let _num = &mut *(num as *const i32).cast_mut();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
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error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
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--> $DIR/reference_casting.rs:21:16
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LL | let _num = &mut *std::ptr::from_ref(num).cast_mut();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
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error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
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--> $DIR/reference_casting.rs:23:16
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LL | let _num = &mut *std::ptr::from_ref({ num }).cast_mut();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
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error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
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--> $DIR/reference_casting.rs:25:16
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LL | let _num = &mut *{ std::ptr::from_ref(num) }.cast_mut();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
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error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
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--> $DIR/reference_casting.rs:27:16
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LL | let _num = &mut *(std::ptr::from_ref({ num }) as *mut i32);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
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error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
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--> $DIR/reference_casting.rs:29:16
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LL | let _num = &mut *(num as *const i32).cast::<i32>().cast_mut();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
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error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
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--> $DIR/reference_casting.rs:31:16
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LL | let _num = &mut *(num as *const i32).cast::<i32>().cast_mut().cast_const().cast_mut();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
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error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
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--> $DIR/reference_casting.rs:33:16
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LL | let _num = &mut *(std::ptr::from_ref(static_u8()) as *mut i8);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
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error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
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--> $DIR/reference_casting.rs:35:16
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LL | let _num = &mut *std::mem::transmute::<_, *mut i32>(num);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
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error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
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--> $DIR/reference_casting.rs:37:16
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LL | let _num = &mut *(std::mem::transmute::<_, *mut i32>(num) as *mut i32);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
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error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
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--> $DIR/reference_casting.rs:39:16
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LL | let _num = &mut *std::cell::UnsafeCell::raw_get(
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| ________________^
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LL | |
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LL | | num as *const i32 as *const std::cell::UnsafeCell<i32>
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LL | | );
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| |_____^
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= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
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error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
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--> $DIR/reference_casting.rs:45:16
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LL | let deferred = num as *const i32 as *mut i32;
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| ----------------------------- casting happend here
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LL | let _num = &mut *deferred;
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| ^^^^^^^^^^^^^^
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= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
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error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
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--> $DIR/reference_casting.rs:48:16
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LL | let deferred = (std::ptr::from_ref(num) as *const i32 as *const i32).cast_mut() as *mut i32;
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| ---------------------------------------------------------------------------- casting happend here
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LL | let _num = &mut *deferred;
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| ^^^^^^^^^^^^^^
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= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
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error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
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--> $DIR/reference_casting.rs:51:16
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LL | let deferred = (std::ptr::from_ref(num) as *const i32 as *const i32).cast_mut() as *mut i32;
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| ---------------------------------------------------------------------------- casting happend here
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...
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LL | let _num = &mut *deferred_rebind;
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| ^^^^^^^^^^^^^^^^^^^^^
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= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
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error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
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--> $DIR/reference_casting.rs:53:16
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LL | let _num = &mut *(num as *const _ as usize as *mut i32);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
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error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
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--> $DIR/reference_casting.rs:55:16
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LL | let _num = &mut *(std::mem::transmute::<_, *mut _>(num as *const i32) as *mut i32);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
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error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
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--> $DIR/reference_casting.rs:62:16
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LL | let num = NUM as *const i32 as *mut i32;
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| ----------------------------- casting happend here
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...
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LL | let _num = &mut *num;
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| ^^^^^^^^^
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= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
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error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
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--> $DIR/reference_casting.rs:66:16
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LL | let _num = &mut *(cell as *const _ as *mut i32);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
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= note: even for types with interior mutability, the only legal way to obtain a mutable pointer from a shared reference is through `UnsafeCell::get`
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error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
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--> $DIR/reference_casting.rs:70:9
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LL | &mut *((this as *const _) as *mut _)
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
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error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
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--> $DIR/reference_casting.rs:75:18
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LL | unsafe { &mut *std::cell::UnsafeCell::raw_get(x as *const _ as *const _) }
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
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error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
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--> $DIR/reference_casting.rs:80:18
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LL | unsafe { &mut *std::cell::UnsafeCell::raw_get(x as *const _ as *const _) }
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
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error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
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--> $DIR/reference_casting.rs:90:5
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LL | *(a as *const _ as *mut _) = String::from("Replaced");
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
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error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
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--> $DIR/reference_casting.rs:92:5
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LL | *(a as *const _ as *mut String) += " world";
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
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error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
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--> $DIR/reference_casting.rs:94:5
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LL | *std::ptr::from_ref(num).cast_mut() += 1;
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
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error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
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--> $DIR/reference_casting.rs:96:5
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LL | *std::ptr::from_ref({ num }).cast_mut() += 1;
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
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error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
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--> $DIR/reference_casting.rs:98:5
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LL | *{ std::ptr::from_ref(num) }.cast_mut() += 1;
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
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error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
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--> $DIR/reference_casting.rs:100:5
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LL | *(std::ptr::from_ref({ num }) as *mut i32) += 1;
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
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error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
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--> $DIR/reference_casting.rs:102:5
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LL | *std::mem::transmute::<_, *mut i32>(num) += 1;
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
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error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
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--> $DIR/reference_casting.rs:104:5
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LL | *(std::mem::transmute::<_, *mut i32>(num) as *mut i32) += 1;
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
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error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
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--> $DIR/reference_casting.rs:106:5
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LL | / std::ptr::write(
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LL | |
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LL | | std::mem::transmute::<*const i32, *mut i32>(num),
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LL | | -1i32,
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LL | | );
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| |_____^
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= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
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error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
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--> $DIR/reference_casting.rs:111:5
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LL | *((&std::cell::UnsafeCell::new(0)) as *const _ as *mut i32) = 5;
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
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= note: even for types with interior mutability, the only legal way to obtain a mutable pointer from a shared reference is through `UnsafeCell::get`
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error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
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--> $DIR/reference_casting.rs:115:5
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LL | let value = num as *const i32 as *mut i32;
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| ----------------------------- casting happend here
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LL | *value = 1;
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| ^^^^^^^^^^
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= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
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error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
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--> $DIR/reference_casting.rs:119:5
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LL | let value = value as *mut i32;
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| ----------------- casting happend here
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LL | *value = 1;
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| ^^^^^^^^^^
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= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
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error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
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--> $DIR/reference_casting.rs:122:5
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LL | let value = num as *const i32 as *mut i32;
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| ----------------------------- casting happend here
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LL | *value = 1;
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| ^^^^^^^^^^
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= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
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error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
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--> $DIR/reference_casting.rs:125:5
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LL | let value = num as *const i32 as *mut i32;
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| ----------------------------- casting happend here
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...
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LL | *value_rebind = 1;
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| ^^^^^^^^^^^^^^^^^
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= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
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error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
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--> $DIR/reference_casting.rs:127:5
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LL | *(num as *const i32).cast::<i32>().cast_mut() = 2;
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
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error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
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--> $DIR/reference_casting.rs:129:5
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LL | *(num as *const _ as usize as *mut i32) = 2;
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
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error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
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--> $DIR/reference_casting.rs:131:5
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LL | let value = num as *const i32 as *mut i32;
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| ----------------------------- casting happend here
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...
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LL | std::ptr::write(value, 2);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
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error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
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--> $DIR/reference_casting.rs:133:5
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LL | let value = num as *const i32 as *mut i32;
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| ----------------------------- casting happend here
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...
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LL | std::ptr::write_unaligned(value, 2);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
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error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
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--> $DIR/reference_casting.rs:135:5
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LL | let value = num as *const i32 as *mut i32;
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| ----------------------------- casting happend here
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...
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LL | std::ptr::write_volatile(value, 2);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
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error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
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--> $DIR/reference_casting.rs:139:9
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LL | *(this as *const _ as *mut _) = a;
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
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error: casting references to a bigger memory layout than the backing allocation is undefined behavior, even if the reference is unused
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--> $DIR/reference_casting.rs:161:20
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LL | let num = &mut 3i32;
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| ---- backing allocation comes from here
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LL |
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LL | let _num = &*(num as *const i32 as *const i64);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: casting from `i32` (4 bytes) to `i64` (8 bytes)
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error: casting references to a bigger memory layout than the backing allocation is undefined behavior, even if the reference is unused
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--> $DIR/reference_casting.rs:163:20
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LL | let num = &mut 3i32;
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| ---- backing allocation comes from here
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...
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LL | let _num = &mut *(num as *mut i32 as *mut i64);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: casting from `i32` (4 bytes) to `i64` (8 bytes)
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error: casting references to a bigger memory layout than the backing allocation is undefined behavior, even if the reference is unused
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--> $DIR/reference_casting.rs:165:20
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LL | let num = &mut 3i32;
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| ---- backing allocation comes from here
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...
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LL | let _num = &mut *(num as *mut i32 as *mut I64);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: casting from `i32` (4 bytes) to `I64` (16 bytes)
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error: casting references to a bigger memory layout than the backing allocation is undefined behavior, even if the reference is unused
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--> $DIR/reference_casting.rs:167:9
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LL | let num = &mut 3i32;
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| ---- backing allocation comes from here
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...
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LL | std::ptr::write(num as *mut i32 as *mut i64, 2);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: casting from `i32` (4 bytes) to `i64` (8 bytes)
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error: casting references to a bigger memory layout than the backing allocation is undefined behavior, even if the reference is unused
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--> $DIR/reference_casting.rs:176:20
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LL | let num = &mut [0i32; 3];
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| --------- backing allocation comes from here
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LL |
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LL | let _num = &mut *(num as *mut _ as *mut [i64; 2]);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: casting from `[i32; 3]` (12 bytes) to `[i64; 2]` (16 bytes)
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error: casting references to a bigger memory layout than the backing allocation is undefined behavior, even if the reference is unused
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--> $DIR/reference_casting.rs:178:9
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LL | let num = &mut [0i32; 3];
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| --------- backing allocation comes from here
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...
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LL | std::ptr::write_unaligned(num as *mut _ as *mut [i32; 4], [0, 0, 1, 1]);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: casting from `[i32; 3]` (12 bytes) to `[i32; 4]` (16 bytes)
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error: casting references to a bigger memory layout than the backing allocation is undefined behavior, even if the reference is unused
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--> $DIR/reference_casting.rs:188:20
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LL | let num = &mut [0i32; 3] as &mut [i32];
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| --------- backing allocation comes from here
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LL |
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LL | let _num = &mut *(num as *mut _ as *mut i128);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: casting from `[i32; 3]` (12 bytes) to `i128` (16 bytes)
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error: casting references to a bigger memory layout than the backing allocation is undefined behavior, even if the reference is unused
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--> $DIR/reference_casting.rs:190:20
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LL | let num = &mut [0i32; 3] as &mut [i32];
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| --------- backing allocation comes from here
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...
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LL | let _num = &mut *(num as *mut _ as *mut [i64; 4]);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: casting from `[i32; 3]` (12 bytes) to `[i64; 4]` (32 bytes)
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error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
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--> $DIR/reference_casting.rs:200:20
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LL | let _num = &mut *(&mat3 as *const _ as *mut [[i64; 3]; 3]);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
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error: casting references to a bigger memory layout than the backing allocation is undefined behavior, even if the reference is unused
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--> $DIR/reference_casting.rs:200:20
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LL | let _num = &mut *(&mat3 as *const _ as *mut [[i64; 3]; 3]);
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| ^^^^^^^^----^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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| |
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| backing allocation comes from here
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= note: casting from `Mat3<i32>` (36 bytes) to `[[i64; 3]; 3]` (72 bytes)
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error: casting references to a bigger memory layout than the backing allocation is undefined behavior, even if the reference is unused
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--> $DIR/reference_casting.rs:203:20
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LL | let _num = &*(&mat3 as *const _ as *mut [[i64; 3]; 3]);
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| ^^^^----^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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| |
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| backing allocation comes from here
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= note: casting from `Mat3<i32>` (36 bytes) to `[[i64; 3]; 3]` (72 bytes)
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error: casting references to a bigger memory layout than the backing allocation is undefined behavior, even if the reference is unused
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--> $DIR/reference_casting.rs:212:37
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LL | let w: *mut [u16; 2] = &mut l as *mut [u8; 2] as *mut _;
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| --------------------------------
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| | |
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| | backing allocation comes from here
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| casting happend here
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LL | let w: *mut [u16] = unsafe {&mut *w};
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| ^^^^^^^
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= note: casting from `[u8; 2]` (2 bytes) to `[u16; 2]` (4 bytes)
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error: casting references to a bigger memory layout than the backing allocation is undefined behavior, even if the reference is unused
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--> $DIR/reference_casting.rs:220:20
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LL | let _num = &*(&num as *const i32 as *const i64);
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| ^^^^---^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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| |
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| backing allocation comes from here
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= note: casting from `[i32; 1]` (4 bytes) to `i64` (8 bytes)
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error: casting references to a bigger memory layout than the backing allocation is undefined behavior, even if the reference is unused
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--> $DIR/reference_casting.rs:222:20
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LL | let _num = &*(&foo() as *const i32 as *const i64);
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| ^^^^-----^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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| |
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| backing allocation comes from here
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= note: casting from `[i32; 1]` (4 bytes) to `i64` (8 bytes)
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error: casting references to a bigger memory layout than the backing allocation is undefined behavior, even if the reference is unused
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--> $DIR/reference_casting.rs:238:20
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LL | let _num = &*(&num as *const i32 as *const i64);
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| ^^^^---^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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| |
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| backing allocation comes from here
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= note: casting from `i32` (4 bytes) to `i64` (8 bytes)
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error: aborting due to 57 previous errors
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