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error[E0277]: the size for values of type `T` cannot be known at compilation time
--> $DIR/const-argument-if-length.rs:15:12
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LL | pub struct AtLeastByte<T: ?Sized> {
| - this type parameter needs to be `Sized`
LL | value: T,
| ^ doesn't have a size known at compile-time
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= note: only the last field of a struct may have a dynamically sized type
= help: change the field's type to have a statically known size
help: consider removing the `?Sized` bound to make the type parameter `Sized`
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LL - pub struct AtLeastByte<T: ?Sized> {
LL + pub struct AtLeastByte<T> {
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help: borrowed types always have a statically known size
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LL | value: &T,
| +
help: the `Box` type always has a statically known size and allocates its contents in the heap
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LL | value: Box<T>,
| ++++ +
error: unconstrained generic constant
--> $DIR/const-argument-if-length.rs:17:10
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LL | pad: [u8; is_zst::<T>()],
| ^^^^^^^^^^^^^^^^^^^
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= help: try adding a `where` bound using this expression: `where [(); is_zst::<T>()]:`
error: aborting due to 2 previous errors
For more information about this error, try `rustc --explain E0277`.
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