Define an experimental event stream version and use it to conditionalize relevant content #1287
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…ize relevant content
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swiftlang/swift-testing#1287 gates the `_testCase` field behind the experimental version number check, which will be tied to the swift version of the client, supplied by vs code. Set the `SWT_ENABLE_EXPERIMENTAL_EVENT_STREAM_TEST_CASE_ENCODING` flag to allow any version of swift-testing to continue to work with the extension.
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* Set env var to preserve test case encoding w/ swift testing swiftlang/swift-testing#1287 gates the `_testCase` field behind the experimental version number check, which will be tied to the swift version of the client, supplied by vs code. Set the `SWT_ENABLE_EXPERIMENTAL_EVENT_STREAM_TEST_CASE_ENCODING` flag to allow any version of swift-testing to continue to work with the extension.
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This PR formally defines an "experimental" event stream version (named
ABI.ExperimentalVersion) which represents content that is considered experimental. It then adopts the new experimental version in several places to conditionalize the inclusion of fields on event stream models which are not yet officially included in any defined, supported version. Finally, it uses this new version everywhere that intentionally always uses the highest experimental version, such as the exit test back channel and the recently-added experimental console output recorder.Motivation:
The event stream now has an established versioning system (as of #956) and can easily conditionalize content based on version. As a general rule, we prefer to exclude content which has not gone through Swift Evolution review when delivering data to event stream consumers which expect to receive content from a supported version. The fields this PR conditionalizes have underscore prefixes and have code-level documentation indicating their unofficial-ness, but the fact that they are included at all in supported/non-experimental version streams could lead to misuse or unintentional breakages in the future if the names or semantics of these fields change.
Checklist: