8 use std::mem::transmute as my_transmute;
9 use std::vec::Vec as MyVec;
11 fn my_int() -> Usize {
15 fn my_vec() -> MyVec<i32> {
19 #[allow(needless_lifetimes)]
20 #[deny(useless_transmute)]
21 unsafe fn _generic<'a, T, U: 'a>(t: &'a T) {
22 let _: &'a T = core::intrinsics::transmute(t);
24 let _: &'a U = core::intrinsics::transmute(t);
26 let _: *const T = core::intrinsics::transmute(t);
28 let _: *mut T = core::intrinsics::transmute(t);
30 let _: *const U = core::intrinsics::transmute(t);
33 #[deny(transmute_ptr_to_ref)]
34 unsafe fn _ptr_to_ref<T, U>(p: *const T, m: *mut T, o: *const U, om: *mut U) {
35 let _: &T = std::mem::transmute(p);
38 let _: &mut T = std::mem::transmute(m);
39 let _: &mut T = &mut *m;
41 let _: &T = std::mem::transmute(m);
44 let _: &mut T = std::mem::transmute(p as *mut T);
45 let _ = &mut *(p as *mut T);
47 let _: &T = std::mem::transmute(o);
48 let _: &T = &*(o as *const T);
50 let _: &mut T = std::mem::transmute(om);
51 let _: &mut T = &mut *(om as *mut T);
53 let _: &T = std::mem::transmute(om);
54 let _: &T = &*(om as *const T);
57 #[deny(transmute_ptr_to_ref)]
59 struct Foo<'a, T: 'a> {
63 let raw = 42 as *const i32;
64 let _: &Foo<u8> = unsafe { std::mem::transmute::<_, &Foo<_>>(raw) };
66 let _: &Foo<&u8> = unsafe { std::mem::transmute::<_, &Foo<&_>>(raw) };
68 type Bar<'a> = &'a u8;
69 let raw = 42 as *const i32;
70 unsafe { std::mem::transmute::<_, Bar>(raw) };
73 #[deny(useless_transmute)]
76 let _: Vec<i32> = core::intrinsics::transmute(my_vec());
78 let _: Vec<i32> = core::mem::transmute(my_vec());
80 let _: Vec<i32> = std::intrinsics::transmute(my_vec());
82 let _: Vec<i32> = std::mem::transmute(my_vec());
84 let _: Vec<i32> = my_transmute(my_vec());
86 let _: Vec<u32> = core::intrinsics::transmute(my_vec());
87 let _: Vec<u32> = core::mem::transmute(my_vec());
88 let _: Vec<u32> = std::intrinsics::transmute(my_vec());
89 let _: Vec<u32> = std::mem::transmute(my_vec());
90 let _: Vec<u32> = my_transmute(my_vec());
92 let _: *const usize = std::mem::transmute(5_isize);
94 let _ = 5_isize as *const usize;
96 let _: *const usize = std::mem::transmute(1+1usize);
98 let _ = (1+1_usize) as *const usize;
104 #[deny(crosspointer_transmute)]
106 let mut int: Usize = Usize(0);
107 let int_const_ptr: *const Usize = &int as *const Usize;
108 let int_mut_ptr: *mut Usize = &mut int as *mut Usize;
111 let _: Usize = core::intrinsics::transmute(int_const_ptr);
113 let _: Usize = core::intrinsics::transmute(int_mut_ptr);
115 let _: *const Usize = core::intrinsics::transmute(my_int());
117 let _: *mut Usize = core::intrinsics::transmute(my_int());