Nate Cook e68069f891 [stdlib] Allow a default for optional interpolations (#80547) ...

This adds an `appendInterpolation` overload to
`DefaultStringInterpolation` that includes a parameter for providing a
default string when the value to interpolate is `nil`. This allows this
kind of usage:

```swift
let age: Int? = nil
print("Your age is \(age, default: "timeless")")
// Prints "Your age is timeless"
```

The change includes an additional fixit when optional values are
interpolated, with a suggestion to use this `default:` parameter.

2025-05-07 12:47:02 -05:00

6.1 KiB

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