Avoid creating cyclic types when reporting errors in selectionType #12223
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The previous code was a great demonstration of the perils of mixing mutable variables with delayed evaluation. Also, make lazy vals in Message @ThreadUnsafe. This means that any recursion (like the one we encountered before the fix) manifests itself in stackoverflows instead of deadlocks. Fixes scala#12220
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The previous code was a great demonstration of the perils of mixing mutable variables with
delayed evaluation.
Also, make lazy vals in Message @ThreadUnsafe. This means that any recursion (like the one we
encountered before the fix) manifests itself in stackoverflows instead of deadlocks.
Fixes #12220