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);
25 let _: &'a U = core::intrinsics::transmute(t);
27 let _: *const T = core::intrinsics::transmute(t);
32 let _: *mut T = core::intrinsics::transmute(t);
37 let _: *const U = core::intrinsics::transmute(t);
43 #[deny(transmute_ptr_to_ref)]
44 unsafe fn _ptr_to_ref<T, U>(p: *const T, m: *mut T, o: *const U, om: *mut U) {
45 let _: &T = std::mem::transmute(p);
51 let _: &mut T = std::mem::transmute(m);
55 let _: &mut T = &mut *m;
57 let _: &T = std::mem::transmute(m);
63 let _: &mut T = std::mem::transmute(p as *mut T);
67 let _ = &mut *(p as *mut T);
69 let _: &T = std::mem::transmute(o);
73 let _: &T = &*(o as *const T);
75 let _: &mut T = std::mem::transmute(om);
79 let _: &mut T = &mut *(om as *mut T);
81 let _: &T = std::mem::transmute(om);
85 let _: &T = &*(om as *const T);
88 #[deny(transmute_ptr_to_ref)]
90 struct Foo<'a, T: 'a> {
94 let raw = 0 as *const i32;
95 let _: &Foo<u8> = unsafe { std::mem::transmute::<_, &Foo<_>>(raw) };
100 let _: &Foo<&u8> = unsafe { std::mem::transmute::<_, &Foo<&_>>(raw) };
105 type Bar<'a> = &'a u8;
106 let raw = 0 as *const i32;
107 unsafe { std::mem::transmute::<_, Bar>(raw) };
113 #[deny(useless_transmute)]
116 let _: Vec<i32> = core::intrinsics::transmute(my_vec());
119 let _: Vec<i32> = core::mem::transmute(my_vec());
122 let _: Vec<i32> = std::intrinsics::transmute(my_vec());
125 let _: Vec<i32> = std::mem::transmute(my_vec());
128 let _: Vec<i32> = my_transmute(my_vec());
131 let _: Vec<u32> = core::intrinsics::transmute(my_vec());
132 let _: Vec<u32> = core::mem::transmute(my_vec());
133 let _: Vec<u32> = std::intrinsics::transmute(my_vec());
134 let _: Vec<u32> = std::mem::transmute(my_vec());
135 let _: Vec<u32> = my_transmute(my_vec());
137 let _: *const usize = std::mem::transmute(5_isize);
141 let _ = 5_isize as *const usize;
143 let _: *const usize = std::mem::transmute(1+1usize);
147 let _ = (1+1_usize) as *const usize;
153 #[deny(crosspointer_transmute)]
155 let mut int: Usize = Usize(0);
156 let int_const_ptr: *const Usize = &int as *const Usize;
157 let int_mut_ptr: *mut Usize = &mut int as *mut Usize;
160 let _: Usize = core::intrinsics::transmute(int_const_ptr);
163 let _: Usize = core::intrinsics::transmute(int_mut_ptr);
166 let _: *const Usize = core::intrinsics::transmute(my_int());
169 let _: *mut Usize = core::intrinsics::transmute(my_int());