[SR-8768] Protect against version mismatch of SwiftSyntax with swift compiler about swift-syntax HOT 6 CLOSED

@swift-ci create

from swift-syntax.

Couldn't reproduce with current swift (master) and swift-syntax (master).
@mdiepWhich version of swift toolchain and SwiftSyntax are you using?

from swift-syntax.

This is with Swift 4.2 and both the `master` and `0.40200.0` branches of SwiftSyntax.

from swift-syntax.

Hmm… I think this is user error from how I was building SwiftSyntax. I was building against my checkout of Swift, which is `master`, when I thought I was building against 4.2.

But it does seem like this still shouldn't crash. If the output from swift is unexpected, it seems like that should result in an error instead of a crash.

from swift-syntax.

This is a case where older SwiftSyntax was matched against newer compiler. Not sure about best way to protect against that and if it is worth it, CC'ing @nkcsgexi, @rintaro, @ahoppen.

from swift-syntax.

This should have been fixed a long time a ago when we started verifying the syntax node hash between the parser library and the SwiftSyntax library.

from swift-syntax.