132 lines
3.3 KiB
Rust
132 lines
3.3 KiB
Rust
#![feature(f128)]
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#![feature(f16)]
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#![allow(
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dead_code,
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clippy::borrow_as_ptr,
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unnecessary_transmutes,
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clippy::needless_lifetimes,
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clippy::missing_transmute_annotations
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)]
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//@no-rustfix
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extern crate core;
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use std::mem::transmute as my_transmute;
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use std::vec::Vec as MyVec;
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fn my_int() -> Usize {
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Usize(42)
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}
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fn my_vec() -> MyVec<i32> {
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vec![]
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}
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#[allow(clippy::needless_lifetimes, clippy::transmute_ptr_to_ptr)]
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#[warn(clippy::useless_transmute)]
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unsafe fn _generic<'a, T, U: 'a>(t: &'a T) {
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unsafe {
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// FIXME: should lint
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// let _: &'a T = core::mem::transmute(t);
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let _: &'a U = core::mem::transmute(t);
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let _: *const T = core::mem::transmute(t);
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//~^ useless_transmute
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let _: *mut T = core::mem::transmute(t);
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//~^ useless_transmute
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let _: *const U = core::mem::transmute(t);
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//~^ useless_transmute
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}
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}
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#[warn(clippy::useless_transmute)]
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fn useless() {
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unsafe {
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let _: Vec<i32> = core::mem::transmute(my_vec());
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//~^ useless_transmute
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let _: Vec<i32> = core::mem::transmute(my_vec());
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//~^ useless_transmute
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let _: Vec<i32> = std::mem::transmute(my_vec());
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//~^ useless_transmute
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let _: Vec<i32> = std::mem::transmute(my_vec());
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//~^ useless_transmute
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let _: Vec<i32> = my_transmute(my_vec());
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//~^ useless_transmute
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let _: *const usize = std::mem::transmute(5_isize);
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//~^ useless_transmute
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let _ = std::ptr::dangling::<usize>();
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let _: *const usize = std::mem::transmute(1 + 1usize);
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//~^ useless_transmute
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let _ = (1 + 1_usize) as *const usize;
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}
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unsafe fn _f<'a, 'b>(x: &'a u32) -> &'b u32 {
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unsafe { std::mem::transmute(x) }
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}
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unsafe fn _f2<'a, 'b>(x: *const (dyn Iterator<Item = u32> + 'a)) -> *const (dyn Iterator<Item = u32> + 'b) {
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unsafe { std::mem::transmute(x) }
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}
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unsafe fn _f3<'a, 'b>(x: fn(&'a u32)) -> fn(&'b u32) {
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unsafe { std::mem::transmute(x) }
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}
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unsafe fn _f4<'a, 'b>(x: std::borrow::Cow<'a, str>) -> std::borrow::Cow<'b, str> {
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unsafe { std::mem::transmute(x) }
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}
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}
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struct Usize(usize);
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#[warn(clippy::crosspointer_transmute)]
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fn crosspointer() {
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let mut int: Usize = Usize(0);
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let int_const_ptr: *const Usize = &int as *const Usize;
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let int_mut_ptr: *mut Usize = &mut int as *mut Usize;
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unsafe {
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let _: Usize = core::mem::transmute(int_const_ptr);
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//~^ crosspointer_transmute
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let _: Usize = core::mem::transmute(int_mut_ptr);
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//~^ crosspointer_transmute
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let _: *const Usize = core::mem::transmute(my_int());
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//~^ crosspointer_transmute
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let _: *mut Usize = core::mem::transmute(my_int());
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//~^ crosspointer_transmute
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}
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}
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#[warn(clippy::transmute_int_to_bool)]
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fn int_to_bool() {
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let _: bool = unsafe { std::mem::transmute(0_u8) };
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//~^ transmute_int_to_bool
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}
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fn bytes_to_str(mb: &mut [u8]) {
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const B: &[u8] = b"";
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let _: &str = unsafe { std::mem::transmute(B) };
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//~^ transmute_bytes_to_str
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let _: &mut str = unsafe { std::mem::transmute(mb) };
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//~^ transmute_bytes_to_str
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const _: &str = unsafe { std::mem::transmute(B) };
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//~^ transmute_bytes_to_str
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}
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fn main() {}
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