Static rustc_ap_rustc_lint_defs::builtin::UNALIGNED_REFERENCES

pub static UNALIGNED_REFERENCES: &Lint

The unaligned_references lint detects unaligned references to fields of packed structs.

Example

#![deny(unaligned_references)]

#[repr(packed)]
pub struct Foo {
    field1: u64,
    field2: u8,
}

fn main() {
    unsafe {
        let foo = Foo { field1: 0, field2: 0 };
        let _ = &foo.field1;
    }
}

{{produces}}

Explanation

Creating a reference to an insufficiently aligned packed field is undefined behavior and should be disallowed.

This lint is "allow" by default because there is no stable alternative, and it is not yet certain how widespread existing code will trigger this lint.

See issue #27060 for more discussion.