20 lines
548 B
Rust
20 lines
548 B
Rust
#![allow(unused_variables)]
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use std::mem;
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use std::cell::Cell;
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// Make sure &mut UnsafeCell also is exclusive
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pub fn safe(x: &i32, y: &mut Cell<i32>) {} //~ ERROR barrier
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fn main() {
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let mut x = 0;
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let xref = &mut x;
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let xraw: *mut i32 = unsafe { mem::transmute_copy(&xref) };
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let xshr = &*xref;
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// transmute fn ptr around so that we can avoid retagging
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let safe_raw: fn(x: *const i32, y: *mut Cell<i32>) = unsafe {
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mem::transmute::<fn(&i32, &mut Cell<i32>), _>(safe)
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};
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safe_raw(xshr, xraw as *mut _);
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}
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