19 lines
782 B
Rust
19 lines
782 B
Rust
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//@ build-fail
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//@ compile-flags: --crate-type lib
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//@ only-32bit Layout computation rejects this layout for different reasons on 64-bit.
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//@ error-pattern: too big for the current architecture
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#![feature(core_intrinsics)]
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#![allow(internal_features)]
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// isize::MAX is fine, but with the padding for the unsized tail it is too big.
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#[repr(C)]
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pub struct Example([u8; isize::MAX as usize], [u16]);
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// We guarantee that with length 0, `size_of_val_raw` (which calls the `size_of_val` intrinsic)
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// is safe to call. The compiler aborts compilation if a length of 0 would overflow.
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// So let's construct a case where length 0 just barely overflows, and ensure that
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// does abort compilation.
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pub fn check(x: *const Example) -> usize {
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unsafe { std::intrinsics::size_of_val(x) }
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}
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