src/test/ui/const-generics/const-argument-if-length.full.stderr

   1 error[E0277]: the size for values of type `T` cannot be known at compilation time
   2   --> $DIR/const-argument-if-length.rs:8:28
   3    |
   4 LL | pub const fn is_zst<T: ?Sized>() -> usize {
   5    |                     - this type parameter needs to be `Sized`
   6 LL |     if std::mem::size_of::<T>() == 0 {
   7    |                            ^ doesn't have a size known at compile-time
   8    |
   9   ::: $SRC_DIR/core/src/mem/mod.rs:LL:COL
  10    |
  11 LL | pub const fn size_of<T>() -> usize {
  12    |                      - required by this bound in `std::mem::size_of`
  13
  14 error[E0277]: the size for values of type `T` cannot be known at compilation time
  15   --> $DIR/const-argument-if-length.rs:17:12
  16    |
  17 LL | pub struct AtLeastByte<T: ?Sized> {
  18    |                        - this type parameter needs to be `Sized`
  19 LL |     value: T,
  20    |            ^ doesn't have a size known at compile-time
  21    |
  22    = note: only the last field of a struct may have a dynamically sized type
  23    = help: change the field's type to have a statically known size
  24 help: borrowed types always have a statically known size
  25    |
  26 LL |     value: &T,
  27    |            ^
  28 help: the `Box` type always has a statically known size and allocates its contents in the heap
  29    |
  30 LL |     value: Box<T>,
  31    |            ^^^^ ^
  32
  33 error: aborting due to 2 previous errors
  34
  35 For more information about this error, try `rustc --explain E0277`.