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// run-pass (note: this is spec-UB, but it works for now) | ||
// ignore-32bit (needs `usize` to be 8-aligned to reproduce all the errors below) | ||
#![allow(dead_code)] | ||
// ignore-emscripten weird assertion? | ||
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#[repr(C, packed(4))] | ||
struct Foo4C { | ||
bar: u8, | ||
baz: usize | ||
} | ||
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pub fn main() { | ||
let foo = Foo4C { bar: 1, baz: 2 }; | ||
let brw = &foo.baz; //~WARN reference to packed field is unaligned | ||
//~^ previously accepted | ||
assert_eq!(*brw, 2); | ||
} |
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src/test/ui/packed/packed-struct-borrow-element-64bit.stderr
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warning: reference to packed field is unaligned | ||
--> $DIR/packed-struct-borrow-element-64bit.rs:14:15 | ||
| | ||
LL | let brw = &foo.baz; | ||
| ^^^^^^^^ | ||
| | ||
= note: `#[warn(unaligned_references)]` on by default | ||
= warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release! | ||
= note: for more information, see issue #82523 <https://github.com/rust-lang/rust/issues/82523> | ||
= note: fields of packed structs are not properly aligned, and creating a misaligned reference is undefined behavior (even if that reference is never dereferenced) | ||
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warning: 1 warning emitted | ||
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