104 lines
2.5 KiB
Rust
104 lines
2.5 KiB
Rust
#![feature(const_fn_transmute)]
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#![allow(dead_code)]
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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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let _: &'a T = core::intrinsics::transmute(t);
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let _: &'a U = core::intrinsics::transmute(t);
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let _: *const T = core::intrinsics::transmute(t);
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let _: *mut T = core::intrinsics::transmute(t);
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let _: *const U = core::intrinsics::transmute(t);
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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::intrinsics::transmute(my_vec());
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let _: Vec<i32> = core::mem::transmute(my_vec());
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let _: Vec<i32> = std::intrinsics::transmute(my_vec());
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let _: Vec<i32> = std::mem::transmute(my_vec());
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let _: Vec<i32> = my_transmute(my_vec());
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let _: *const usize = std::mem::transmute(5_isize);
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let _ = 5_isize as *const usize;
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let _: *const usize = std::mem::transmute(1 + 1usize);
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let _ = (1 + 1_usize) as *const usize;
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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::intrinsics::transmute(int_const_ptr);
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let _: Usize = core::intrinsics::transmute(int_mut_ptr);
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let _: *const Usize = core::intrinsics::transmute(my_int());
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let _: *mut Usize = core::intrinsics::transmute(my_int());
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}
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}
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#[warn(clippy::transmute_int_to_char)]
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fn int_to_char() {
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let _: char = unsafe { std::mem::transmute(0_u32) };
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let _: char = unsafe { std::mem::transmute(0_i32) };
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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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}
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#[warn(clippy::transmute_int_to_float)]
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mod int_to_float {
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fn test() {
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let _: f32 = unsafe { std::mem::transmute(0_u32) };
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let _: f32 = unsafe { std::mem::transmute(0_i32) };
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}
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// See issue #5747
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const VALUE: f32 = unsafe { std::mem::transmute(0_u32) };
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const fn from_bits(v: u32) -> f32 {
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unsafe { std::mem::transmute(v) }
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}
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}
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fn bytes_to_str(b: &[u8], mb: &mut [u8]) {
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let _: &str = unsafe { std::mem::transmute(b) };
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let _: &mut str = unsafe { std::mem::transmute(mb) };
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}
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fn main() {}
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