rust-clippy/tests/ui/cast_alignment.rs
Florian Gilcher aa72cac87a
Improve cast_ptr_alignment lint
* print alignment in bytes in the lint message
* ignore ZST left-hand types
2019-07-09 17:02:26 +02:00

27 lines
870 B
Rust

//! Test casts for alignment issues
#![feature(rustc_private)]
extern crate libc;
#[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;
/* 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;
// 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;
}