Konrad `ktoso` Malawski 0d3a4b44b8 [Concurrency] if let value on async value should be banned (not crash) ...

The issue is that the shorthand if let syntax injects an implicit
expression: https://github.com/apple/swift/pull/40694/ in ParseStmt and
that the 'diagnoseUnhandledAsyncSite' explicitly avoids reporting errors
in implicit expressions.

This change is that we don't mark the implicit declref code emitted by
the `if let prop` as implicit anymore, and this way the reporting works
out as expected.

Added some tests covering this as well as properly erroring out for the
nonexistent syntax of shortand + awaiting which doesn't exist, and we
properly error on it.

Resolves rdar://126169564

2024-06-19 17:20:18 +09:00

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