22 lines
697 B
Rust
22 lines
697 B
Rust
// Issue 36278: On an unsized struct with >1 level of nontrivial
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// nesting, ensure we are computing dynamic size of prefix correctly.
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use std::mem;
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const SZ: usize = 100;
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struct P<T: ?Sized>([u8; SZ], T);
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type Ack<T> = P<P<T>>;
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fn main() {
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let size_of_sized; let size_of_unsized;
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let x: Box<Ack<[u8; 0]>> = Box::new(P([0; SZ], P([0; SZ], [0; 0])));
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size_of_sized = mem::size_of_val::<Ack<_>>(&x);
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let align_of_sized = mem::align_of_val::<Ack<_>>(&x);
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let y: Box<Ack<[u8 ]>> = x;
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size_of_unsized = mem::size_of_val::<Ack<_>>(&y);
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assert_eq!(size_of_sized, size_of_unsized);
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assert_eq!(align_of_sized, 1);
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assert_eq!(mem::align_of_val::<Ack<_>>(&y), 1);
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}
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