3fdd8d5ef3
The implied deref to statics introduced by HIR->THIR lowering is only
used to create place expressions, it lacks unsafe semantics.
It is also confusing, as there is no visible `*ident` in the source.
For both classes of "unsafe static" (extern static and static mut)
allow this operation.
We lack a clear story around `thread_local! { static mut }`, which
is actually its own category of item that reuses the static syntax but
has its own rules. It's possible they should be similarly included, but
in the absence of a good reason one way or another, we do not bless it.
20 lines
1013 B
Plaintext
20 lines
1013 B
Plaintext
error[E0133]: dereference of raw pointer is unsafe and requires unsafe function or block
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--> $DIR/raw-ref-deref-without-unsafe.rs:12:56
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LL | static mut DEREF_BYTE_PTR: *mut u8 = ptr::addr_of_mut!(*BYTE_PTR);
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| ^^^^^^^^^ dereference of raw pointer
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= note: raw pointers may be null, dangling or unaligned; they can violate aliasing rules and cause data races: all of these are undefined behavior
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error[E0133]: use of mutable static is unsafe and requires unsafe function or block
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--> $DIR/raw-ref-deref-without-unsafe.rs:12:57
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LL | static mut DEREF_BYTE_PTR: *mut u8 = ptr::addr_of_mut!(*BYTE_PTR);
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| ^^^^^^^^ use of mutable static
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= note: mutable statics can be mutated by multiple threads: aliasing violations or data races will cause undefined behavior
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error: aborting due to 2 previous errors
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For more information about this error, try `rustc --explain E0133`.
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