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
415 B
Rust
20 lines
415 B
Rust
//@ run-pass
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#![feature(const_refs_to_static)]
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static S: i32 = 0;
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static mut S_MUT: i32 = 0;
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const C1: &i32 = &S;
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#[allow(unused)]
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const C1_READ: () = {
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assert!(*C1 == 0);
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};
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const C2: *const i32 = std::ptr::addr_of!(S_MUT);
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fn main() {
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assert_eq!(*C1, 0);
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assert_eq!(unsafe { *C2 }, 0);
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// Computing this pattern will read from an immutable static. That's fine.
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assert!(matches!(&0, C1));
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}
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