First Draft: opUnwrapIfTrue

[Per Nordlöw]

On Thursday, 26 February 2026 at 13:53:41 UTC, Richard (Rikki) 
Andrew Cattermole wrote:
> The DIP: 
> https://gist.github.com/rikkimax/21242118e3bc1bf5f28024c2cdc33557

Nice.

Regarding the lowering

```d
if (Result!int result2 = result, result2.opCast!bool) {
	scope(exit) result2.destroy;
	...
} else {
	result2.destroy;
}
```

are

```d
	scope(exit) result2.destroy;
	result2.destroy;
```

eagerly elided when `__traits(needsDestruction, typeof(result2))` 
is false or are the injected the lower regardless and then later 
elided? Just checking to make sure the lowering doesn't inject 
AST unneccesary nodes.