Improve unexpected tokens diagnostics

[mateusrodriguesxyz]

While investigating https://github.com/swiftlang/swift-syntax/issues/1373 I noticed that replacing a break with a continue in canRecoverTo improves diagnostic in a number of recovery tests. I've also added a little logic to call skipSingle so we achieve desired diagnostic in testRecovery105(), but only if possible at the same line, so cases like testRecovery100() is not messed up.

[ahoppen]

@swift-ci Please test

[mateusrodriguesxyz]

Couldn't figure out what caused the tests to fail 🤔

[ahoppen]

Looks like BasicFormatTest.testClosureParameter failed. That test did look unrelated to your other changes anyway.

/Users/ec2-user/jenkins/workspace/swift-syntax-PR-macOS/branch-main/swift-syntax/Tests/SwiftBasicFormatTest/BasicFormatTests.swift:62: error: -[SwiftBasicFormatTest.BasicFormatTest testClosureParameter] : failed - Actual output does not match the expected
 myFunc({
     return true
–})
+    })

[ahoppen]

@swift-ci Please test

[ahoppen]

@swift-ci Please test Windows

[ahoppen]

Oh, looks like the errors are unrelated to your PR, they also seem to fail in https://github.com/swiftlang/swift-syntax/pull/2814.

[mateusrodriguesxyz]

These failed in https://github.com/swiftlang/swift-syntax/pull/2814 too.

[DougGregor]

I think https://github.com/swiftlang/swift/pull/76040 will fix this issue

[mateusrodriguesxyz]

@ahoppen I think this should pass now that https://github.com/swiftlang/swift/pull/76040 has been merged. Could you test again, please?

[DougGregor]

@swift-ci please test

[mateusrodriguesxyz]

Thanks @DougGregor !