Merge PR #8315 & #8316 in to stable

[omerfirmak]

as they are essentially non-breaking bug fixes.

[dlang-bot]

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Bugzilla references

Auto-close	Bugzilla	Severity	Description
✗	22510	major	Structs with copy constructor can not be heap allocated with default constructor
✓	22511	enhancement	Nullable is not copyable when templated type has elaborate copy ctor

Testing this PR locally

If you don't have a local development environment setup, you can use Digger to test this PR:

dub run digger -- build "stable + phobos#8318"

[omerfirmak]

thanks @RazvanN7