[5.9] Slightly clean up FixIt.Change and FixIt.Changes
#1496
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The existing API with `FixIt.Change` and `FixIt.Changes` and the fact that we passed `[FixIt.Changes]` around what fairly weird. Ideally, we would only have `FixIt.Change` and make it powerful enough to represent all the trivia transfer that `FixIt.Changes` is doing. But given that that will be a larger effort, let’s make some smaller changes now that reduce the badness of the public API impact: - Move `FixIt.Changes` to `SwiftParserDiagnostics`, make it internal and rename it to `MultiNodeChange`. That way this type is no longer exposed in the public API, so we can iterate on it or remove it without breaking clients. The only thing that remains exposed is `FixIt.Change`, which we want to continue to support. We will probably add more cases to it in the future. - Make `FixIt.Changes` no longer conform to `ExpressibleByArrayLiteral`. That just makes everything a lot more explicit and easier to follow. - Remove some unecessary initializations of `FixIt.Changes` where `FixIt.Change` was sufficient. - Make `presence` on `TokenSyntax` settable so you can do `token.with(\.presence, .missing)` - Slightly unrelated: Rename SyntaxOtherNodes.swift to TokenSyntax.swift because that’s the only node it contains.
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DougGregor
approved these changes
Apr 6, 2023
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Cherry-pick #1460 to release/5.9
The existing API with
FixIt.ChangeandFixIt.Changesand the fact that we passed[FixIt.Changes]around what fairly weird.Ideally, we would only have
FixIt.Changeand make it powerful enough to represent all the trivia transfer thatFixIt.Changesis doing. But given that that will be a larger effort, let’s make some smaller changes now that reduce the badness of the public API impact:FixIt.ChangestoSwiftParserDiagnostics, make it internal and rename it toMultiNodeChange. That way this type is no longer exposed in the public API, so we can iterate on it or remove it without breaking clients. The only thing that remains exposed isFixIt.Change, which we want to continue to support. We will probably add more cases to it in the future.FixIt.Changesno longer conform toExpressibleByArrayLiteral. That just makes everything a lot more explicit and easier to follow.FixIt.ChangeswhereFixIt.Changewas sufficient.presenceonTokenSyntaxsettable so you can dotoken.with(\.presence, .missing)