Pavel Yaskevich 69bd48e2ea [CSSimplify] CGFloat-Double: Rank narrowing correctly when result is injected into an optional ...

If result of `CGFloat` -> `Double` conversion is injected into an optional
it should be ranked based on depth just like when locator is fully simplified.

For example:

```swift
func test(v: CGFloat?) {
   _ = v ?? 2.0 / 3.0
}
```

In this expression division should be performed on `Double` and result
narrowed down (based on the rule that narrowing conversion should always
be delayed) but `Double` -> `CGFloat?` was given an incorrect score and
instead of picking `?? (_: T?, _: T) -> T` overload, the solver would
use `?? (_: T?, _: T?) -> T?`.

(cherry picked from commit cb876cbd9e)

2025-06-27 23:43:09 -07:00

637 KiB

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