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

   1 error[E0080]: it is undefined behavior to use this value
   2   --> $DIR/ub-ref-ptr.rs:12:1
   3    |
   4 LL | const UNALIGNED: &u16 = unsafe { mem::transmute(&[0u8; 4]) };
   5    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered an unaligned reference (required 2 byte alignment but found 1)
   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-ref-ptr.rs:16:1
  11    |
  12 LL | const UNALIGNED_BOX: Box<u16> = unsafe { mem::transmute(&[0u8; 4]) };
  13    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered an unaligned box (required 2 byte alignment but found 1)
  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-ref-ptr.rs:20:1
  19    |
  20 LL | const NULL: &u16 = unsafe { mem::transmute(0usize) };
  21    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered a NULL reference
  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-ref-ptr.rs:23:1
  27    |
  28 LL | const NULL_BOX: Box<u16> = unsafe { mem::transmute(0usize) };
  29    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered a NULL box
  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-ref-ptr.rs:29:1
  35    |
  36 LL | const REF_AS_USIZE: usize = unsafe { mem::transmute(&0) };
  37    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered pointer to alloc14, but expected initialized plain (non-pointer) bytes
  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-ref-ptr.rs:32:1
  43    |
  44 LL | const REF_AS_USIZE_SLICE: &[usize] = &[unsafe { mem::transmute(&0) }];
  45    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered a pointer at .<deref>, but expected plain (non-pointer) bytes
  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-ref-ptr.rs:35:1
  51    |
  52 LL | const REF_AS_USIZE_BOX_SLICE: Box<[usize]> = unsafe { mem::transmute::<&[usize], _>(&[mem::transmute(&0)]) };
  53    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered a pointer at .<deref>, but expected plain (non-pointer) bytes
  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-ref-ptr.rs:38:1
  59    |
  60 LL | const USIZE_AS_REF: &'static u8 = unsafe { mem::transmute(1337usize) };
  61    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered a dangling reference (created from integer)
  62    |
  63    = 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.
  64
  65 error[E0080]: it is undefined behavior to use this value
  66   --> $DIR/ub-ref-ptr.rs:41:1
  67    |
  68 LL | const USIZE_AS_BOX: Box<u8> = unsafe { mem::transmute(1337usize) };
  69    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered a dangling box (created from integer)
  70    |
  71    = 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.
  72
  73 error[E0080]: it is undefined behavior to use this value
  74   --> $DIR/ub-ref-ptr.rs:44:1
  75    |
  76 LL | const UNINIT_PTR: *const i32 = unsafe { MaybeUninit { uninit: () }.init };
  77    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered uninitialized raw pointer
  78    |
  79    = 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.
  80
  81 error[E0080]: it is undefined behavior to use this value
  82   --> $DIR/ub-ref-ptr.rs:46:1
  83    |
  84 LL | const UNINIT_FN_PTR: fn() = unsafe { MaybeUninit { uninit: () }.init };
  85    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered uninitialized bytes, but expected a function pointer
  86    |
  87    = 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.
  88
  89 error: aborting due to 11 previous errors
  90
  91 For more information about this error, try `rustc --explain E0080`.