20 lines
569 B
Rust
20 lines
569 B
Rust
#[repr(u32)]
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#[derive(Debug)]
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enum Bool {
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True,
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}
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fn evil(x: &mut Bool) {
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let x = x as *mut _ as *mut u32;
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unsafe { *x = 44 }; // out-of-bounds enum tag
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}
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#[rustfmt::skip] // rustfmt bug: https://github.com/rust-lang/rustfmt/issues/5391
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fn main() {
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let mut x = Bool::True;
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evil(&mut x);
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let y = x; // reading this ought to be enough to trigger validation
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//~^ ERROR constructing invalid value at .<enum-tag>: encountered 0x0000002c, but expected a valid enum tag
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println!("{:?}", y); // make sure it is used (and not optimized away)
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}
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