a1b0702ea5
Add small clarification around using pointers derived from references r? `@RalfJung` One question about your example from https://github.com/rust-lang/libs-team/issues/122: at what point does UB arise? If writing 0 does not cause UB and the reference `x` is never read or written to (explicitly or implicitly by being wrapped in another data structure) after the call to `foo`, does UB only arise when dropping the value? I don't really get that since I thought references were always supposed to point to valid data? ```rust fn foo(x: &mut NonZeroI32) { let ptr = x as *mut NonZeroI32; unsafe { ptr.cast::<i32>().write(0); } // no UB here // What now? x is considered garbage when? } ``` |
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