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Diffstat (limited to '')
-rw-r--r-- | src/test/ui/issues/issue-36278-prefix-nesting.rs | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/src/test/ui/issues/issue-36278-prefix-nesting.rs b/src/test/ui/issues/issue-36278-prefix-nesting.rs new file mode 100644 index 000000000..a809f7f13 --- /dev/null +++ b/src/test/ui/issues/issue-36278-prefix-nesting.rs @@ -0,0 +1,20 @@ +// run-pass +// Issue 36278: On an unsized struct with >1 level of nontrivial +// nesting, ensure we are computing dynamic size of prefix correctly. + +use std::mem; + +const SZ: usize = 100; +#[allow(unused_tuple_struct_fields)] +struct P<T: ?Sized>([u8; SZ], T); + +type Ack<T> = P<P<T>>; + +fn main() { + let size_of_sized; let size_of_unsized; + let x: Box<Ack<[u8; 0]>> = Box::new(P([0; SZ], P([0; SZ], [0; 0]))); + size_of_sized = mem::size_of_val::<Ack<_>>(&x); + let y: Box<Ack<[u8 ]>> = x; + size_of_unsized = mem::size_of_val::<Ack<_>>(&y); + assert_eq!(size_of_sized, size_of_unsized); +} |