Add support for if/switch expressions #354
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As pointed out in #351. [SE-0380](https://github.com/apple/swift-evolution/blob/main/proposals/0380-if-switch-expressions.md) made it possible to do this, but support was lacking in this repository. The fix turned out to be easier than anticipated, simply requiring the statement to be added in some new places. Theoretically, it should also be renamed, but that would make this a breaking change. The proposal does not make clear whether labels are permitted on expression-position `if` and `switch` statements. This assumes they are not, for simplicity.
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As pointed out in #351.
SE-0380
made it possible to do this, but support was lacking in this repository.
The fix turned out to be easier than anticipated, simply requiring the
statement to be added in some new places. Theoretically, it should also
be renamed, but that would make this a breaking change.
The proposal does not make clear whether labels are permitted on
expression-position
ifandswitchstatements. This assumes they arenot, for simplicity.