1 #![feature(const_fn_transmute)]
6 use std::mem::transmute as my_transmute;
7 use std::vec::Vec as MyVec;
13 fn my_vec() -> MyVec<i32> {
17 #[allow(clippy::needless_lifetimes, clippy::transmute_ptr_to_ptr)]
18 #[warn(clippy::useless_transmute)]
19 unsafe fn _generic<'a, T, U: 'a>(t: &'a T) {
20 let _: &'a T = core::intrinsics::transmute(t);
22 let _: &'a U = core::intrinsics::transmute(t);
24 let _: *const T = core::intrinsics::transmute(t);
26 let _: *mut T = core::intrinsics::transmute(t);
28 let _: *const U = core::intrinsics::transmute(t);
31 #[warn(clippy::useless_transmute)]
34 let _: Vec<i32> = core::intrinsics::transmute(my_vec());
36 let _: Vec<i32> = core::mem::transmute(my_vec());
38 let _: Vec<i32> = std::intrinsics::transmute(my_vec());
40 let _: Vec<i32> = std::mem::transmute(my_vec());
42 let _: Vec<i32> = my_transmute(my_vec());
44 let _: *const usize = std::mem::transmute(5_isize);
46 let _ = 5_isize as *const usize;
48 let _: *const usize = std::mem::transmute(1 + 1usize);
50 let _ = (1 + 1_usize) as *const usize;
56 #[warn(clippy::crosspointer_transmute)]
58 let mut int: Usize = Usize(0);
59 let int_const_ptr: *const Usize = &int as *const Usize;
60 let int_mut_ptr: *mut Usize = &mut int as *mut Usize;
63 let _: Usize = core::intrinsics::transmute(int_const_ptr);
65 let _: Usize = core::intrinsics::transmute(int_mut_ptr);
67 let _: *const Usize = core::intrinsics::transmute(my_int());
69 let _: *mut Usize = core::intrinsics::transmute(my_int());
73 #[warn(clippy::transmute_int_to_char)]
75 let _: char = unsafe { std::mem::transmute(0_u32) };
76 let _: char = unsafe { std::mem::transmute(0_i32) };
79 #[warn(clippy::transmute_int_to_bool)]
81 let _: bool = unsafe { std::mem::transmute(0_u8) };
84 #[warn(clippy::transmute_int_to_float)]
87 let _: f32 = unsafe { std::mem::transmute(0_u32) };
88 let _: f32 = unsafe { std::mem::transmute(0_i32) };
89 let _: f64 = unsafe { std::mem::transmute(0_u64) };
90 let _: f64 = unsafe { std::mem::transmute(0_i64) };
94 const VALUE32: f32 = unsafe { std::mem::transmute(0_u32) };
95 const VALUE64: f64 = unsafe { std::mem::transmute(0_i64) };
97 const fn from_bits_32(v: i32) -> f32 {
98 unsafe { std::mem::transmute(v) }
101 const fn from_bits_64(v: u64) -> f64 {
102 unsafe { std::mem::transmute(v) }
107 fn bytes_to_str(b: &[u8], mb: &mut [u8]) {
108 let _: &str = unsafe { std::mem::transmute(b) };
109 let _: &mut str = unsafe { std::mem::transmute(mb) };