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another test for too big type #2039

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Merged
merged 1 commit into from
Mar 26, 2022
Merged

another test for too big type #2039

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0 tests/compile-fail/slice-too-big.rs → tests/compile-fail/too-big-slice.rs
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18 changes: 18 additions & 0 deletions tests/compile-fail/too-big-unsized.rs
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Original file line number Diff line number Diff line change
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use std::mem;

#[allow(unused)]
struct MySlice {
prefix: u64,
tail: [u8],
}

#[cfg(target_pointer_width = "64")]
const TOO_BIG: usize = 1usize << 47;
#[cfg(target_pointer_width = "32")]
const TOO_BIG: usize = 1usize << 31;

fn main() { unsafe {
let ptr = Box::into_raw(Box::new(0u8));
// The slice part is actually not "too big", but together with the `prefix` field it is.
let _x: &MySlice = mem::transmute((ptr, TOO_BIG-1)); //~ ERROR: invalid reference metadata: total size is bigger than largest supported object
} }