src/test/ui/consts/const-eval/ub-wide-ptr.stderr

   1 error[E0080]: it is undefined behavior to use this value
   2   --> $DIR/ub-wide-ptr.rs:32:1
   3    |
   4 LL | const STR_TOO_LONG: &str = unsafe { mem::transmute((&42u8, 999usize)) };
   5    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered a dangling reference (going beyond the bounds of its allocation)
   6    |
   7    = note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
   8
   9 error[E0080]: it is undefined behavior to use this value
  10   --> $DIR/ub-wide-ptr.rs:34:1
  11    |
  12 LL | const NESTED_STR_MUCH_TOO_LONG: (&str,) = (unsafe { mem::transmute((&42, usize::MAX)) },);
  13    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered invalid reference metadata: slice is bigger than largest supported object at .0
  14    |
  15    = note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
  16
  17 error[E0080]: it is undefined behavior to use this value
  18   --> $DIR/ub-wide-ptr.rs:37:1
  19    |
  20 LL | const STR_LENGTH_PTR: &str = unsafe { mem::transmute((&42u8, &3)) };
  21    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered non-integer slice length in wide pointer
  22    |
  23    = note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
  24
  25 error[E0080]: it is undefined behavior to use this value
  26   --> $DIR/ub-wide-ptr.rs:40:1
  27    |
  28 LL | const MY_STR_LENGTH_PTR: &MyStr = unsafe { mem::transmute((&42u8, &3)) };
  29    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered non-integer slice length in wide pointer
  30    |
  31    = note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
  32
  33 error[E0080]: it is undefined behavior to use this value
  34   --> $DIR/ub-wide-ptr.rs:42:1
  35    |
  36 LL | const MY_STR_MUCH_TOO_LONG: &MyStr = unsafe { mem::transmute((&42u8, usize::MAX)) };
  37    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered invalid reference metadata: slice is bigger than largest supported object
  38    |
  39    = note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
  40
  41 error[E0080]: it is undefined behavior to use this value
  42   --> $DIR/ub-wide-ptr.rs:46:1
  43    |
  44 LL | const STR_NO_UTF8: &str = unsafe { mem::transmute::<&[u8], _>(&[0xFF]) };
  45    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered uninitialized or non-UTF-8 data in str at .<deref>
  46    |
  47    = note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
  48
  49 error[E0080]: it is undefined behavior to use this value
  50   --> $DIR/ub-wide-ptr.rs:49:1
  51    |
  52 LL | const MYSTR_NO_UTF8: &MyStr = unsafe { mem::transmute::<&[u8], _>(&[0xFF]) };
  53    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered uninitialized or non-UTF-8 data in str at .<deref>.0
  54    |
  55    = note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
  56
  57 error[E0080]: it is undefined behavior to use this value
  58   --> $DIR/ub-wide-ptr.rs:56:1
  59    |
  60 LL | / const SLICE_LENGTH_UNINIT: &[u8] = unsafe {
  61 LL | |
  62 LL | |     let uninit_len = MaybeUninit::<usize> { uninit: () };
  63 LL | |     mem::transmute((42, uninit_len))
  64 LL | | };
  65    | |__^ type validation failed: encountered uninitialized reference
  66    |
  67    = note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
  68
  69 error[E0080]: it is undefined behavior to use this value
  70   --> $DIR/ub-wide-ptr.rs:62:1
  71    |
  72 LL | const SLICE_TOO_LONG: &[u8] = unsafe { mem::transmute((&42u8, 999usize)) };
  73    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered a dangling reference (going beyond the bounds of its allocation)
  74    |
  75    = note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
  76
  77 error[E0080]: it is undefined behavior to use this value
  78   --> $DIR/ub-wide-ptr.rs:65:1
  79    |
  80 LL | const SLICE_LENGTH_PTR: &[u8] = unsafe { mem::transmute((&42u8, &3)) };
  81    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered non-integer slice length in wide pointer
  82    |
  83    = note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
  84
  85 error[E0080]: it is undefined behavior to use this value
  86   --> $DIR/ub-wide-ptr.rs:68:1
  87    |
  88 LL | const SLICE_TOO_LONG_BOX: Box<[u8]> = unsafe { mem::transmute((&42u8, 999usize)) };
  89    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered a dangling box (going beyond the bounds of its allocation)
  90    |
  91    = note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
  92
  93 error[E0080]: it is undefined behavior to use this value
  94   --> $DIR/ub-wide-ptr.rs:71:1
  95    |
  96 LL | const SLICE_LENGTH_PTR_BOX: Box<[u8]> = unsafe { mem::transmute((&42u8, &3)) };
  97    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered non-integer slice length in wide pointer
  98    |
  99    = note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
 100
 101 error[E0080]: it is undefined behavior to use this value
 102   --> $DIR/ub-wide-ptr.rs:75:1
 103    |
 104 LL | const SLICE_CONTENT_INVALID: &[bool] = &[unsafe { mem::transmute(3u8) }];
 105    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered 3 at .<deref>[0], but expected a boolean
 106    |
 107    = note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
 108
 109 error[E0080]: it is undefined behavior to use this value
 110   --> $DIR/ub-wide-ptr.rs:81:1
 111    |
 112 LL | const MYSLICE_PREFIX_BAD: &MySliceBool = &MySlice(unsafe { mem::transmute(3u8) }, [false]);
 113    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered 3 at .<deref>.0, but expected a boolean
 114    |
 115    = note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
 116
 117 error[E0080]: it is undefined behavior to use this value
 118   --> $DIR/ub-wide-ptr.rs:84:1
 119    |
 120 LL | const MYSLICE_SUFFIX_BAD: &MySliceBool = &MySlice(true, [unsafe { mem::transmute(3u8) }]);
 121    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered 3 at .<deref>.1[0], but expected a boolean
 122    |
 123    = note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
 124
 125 error[E0080]: it is undefined behavior to use this value
 126   --> $DIR/ub-wide-ptr.rs:91:1
 127    |
 128 LL | / const RAW_SLICE_LENGTH_UNINIT: *const [u8] = unsafe {
 129 LL | |
 130 LL | |     let uninit_len = MaybeUninit::<usize> { uninit: () };
 131 LL | |     mem::transmute((42, uninit_len))
 132 LL | | };
 133    | |__^ type validation failed: encountered uninitialized raw pointer
 134    |
 135    = note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
 136
 137 error[E0080]: it is undefined behavior to use this value
 138   --> $DIR/ub-wide-ptr.rs:99:1
 139    |
 140 LL | const TRAIT_OBJ_SHORT_VTABLE_1: &dyn Trait = unsafe { mem::transmute((&92u8, &3u8)) };
 141    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered dangling or unaligned vtable pointer in wide pointer or too small vtable
 142    |
 143    = note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
 144
 145 error[E0080]: it is undefined behavior to use this value
 146   --> $DIR/ub-wide-ptr.rs:102:1
 147    |
 148 LL | const TRAIT_OBJ_SHORT_VTABLE_2: &dyn Trait = unsafe { mem::transmute((&92u8, &3u64)) };
 149    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered dangling or unaligned vtable pointer in wide pointer or too small vtable
 150    |
 151    = note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
 152
 153 error[E0080]: it is undefined behavior to use this value
 154   --> $DIR/ub-wide-ptr.rs:105:1
 155    |
 156 LL | const TRAIT_OBJ_INT_VTABLE: &dyn Trait = unsafe { mem::transmute((&92u8, 4usize)) };
 157    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered dangling or unaligned vtable pointer in wide pointer or too small vtable
 158    |
 159    = note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
 160
 161 error[E0080]: it is undefined behavior to use this value
 162   --> $DIR/ub-wide-ptr.rs:109:1
 163    |
 164 LL | const TRAIT_OBJ_CONTENT_INVALID: &dyn Trait = unsafe { mem::transmute::<_, &bool>(&3u8) };
 165    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered 3 at .<deref>.<dyn-downcast>, but expected a boolean
 166    |
 167    = note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
 168
 169 error[E0080]: it is undefined behavior to use this value
 170   --> $DIR/ub-wide-ptr.rs:113:1
 171    |
 172 LL | const RAW_TRAIT_OBJ_VTABLE_NULL: *const dyn Trait = unsafe { mem::transmute((&92u8, 0usize)) };
 173    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered dangling or unaligned vtable pointer in wide pointer or too small vtable
 174    |
 175    = note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
 176
 177 error[E0080]: it is undefined behavior to use this value
 178   --> $DIR/ub-wide-ptr.rs:115:1
 179    |
 180 LL | const RAW_TRAIT_OBJ_VTABLE_INVALID: *const dyn Trait = unsafe { mem::transmute((&92u8, &3u64)) };
 181    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered dangling or unaligned vtable pointer in wide pointer or too small vtable
 182    |
 183    = note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
 184
 185 error[E0080]: could not evaluate static initializer
 186   --> $DIR/ub-wide-ptr.rs:121:5
 187    |
 188 LL |     mem::transmute::<_, &dyn Trait>((&92u8, 0usize))
 189    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ invalid use of NULL pointer
 190
 191 error[E0080]: could not evaluate static initializer
 192   --> $DIR/ub-wide-ptr.rs:125:5
 193    |
 194 LL |     mem::transmute::<_, &dyn Trait>((&92u8, &3u64))
 195    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Memory access failed: pointer must be in-bounds at offset N, but is outside bounds of allocN which has size N
 196
 197 error: aborting due to 24 previous errors
 198
 199 For more information about this error, try `rustc --explain E0080`.