fixes for Box<[T]>#17110
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The pointer in the slice must not be null, because enum representations make that assumption. The `exchange_malloc` function returns a non-null sentinel for the zero size case, and it must not be passed to the `exchange_free` lang item. Since the length is always equal to the true capacity, a branch on the length is enough for most types. Slices of zero size types are statically special cased to never attempt deallocation. This is the same implementation as `Vec<T>`. Closes #14395
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The pointer in the slice must not be null, because enum representations make that assumption. The `exchange_malloc` function returns a non-null sentinel for the zero size case, and it must not be passed to the `exchange_free` lang item. Since the length is always equal to the true capacity, a branch on the length is enough for most types. Slices of zero size types are statically special cased to never attempt deallocation. This is the same implementation as `Vec<T>`. Closes #14395
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Apr 20, 2024
Cargo script mvp Based on rust-lang/rust-analyzer#15456, As the original PR stated, detached files are still horrendous to work with.
lnicola
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Apr 20, 2024
Cargo script mvp Based on rust-lang/rust-analyzer#15456, As the original PR stated, detached files are still horrendous to work with.
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The pointer in the slice must not be null, because enum representations
make that assumption. The
exchange_mallocfunction returns a non-nullsentinel for the zero size case, and it must not be passed to the
exchange_freelang item.Since the length is always equal to the true capacity, a branch on the
length is enough for most types. Slices of zero size types are
statically special cased to never attempt deallocation. This is the same
implementation as
Vec<T>.Closes #14395