rust/tests/ui/cast_alignment.rs

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//! Test casts for alignment issues
#![feature(rustc_private)]
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extern crate libc;
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#[warn(clippy::cast_ptr_alignment)]
#[allow(clippy::no_effect, clippy::unnecessary_operation, clippy::cast_lossless)]
fn main() {
/* These should be warned against */
// cast to more-strictly-aligned type
(&1u8 as *const u8) as *const u16;
(&mut 1u8 as *mut u8) as *mut u16;
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/* These should be ok */
// not a pointer type
1u8 as u16;
// cast to less-strictly-aligned type
(&1u16 as *const u16) as *const u8;
(&mut 1u16 as *mut u16) as *mut u8;
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// For c_void, we should trust the user. See #2677
(&1u32 as *const u32 as *const std::os::raw::c_void) as *const u32;
(&1u32 as *const u32 as *const libc::c_void) as *const u32;
// For ZST, we should trust the user. See #4256
(&1u32 as *const u32 as *const ()) as *const u32;
}