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Let postfix IS tests chain onto predicate results #1365

Job	Run time
Gradle Check (ubuntu-latest)	2m 42s
Gradle Check (macos-latest)	4m 41s
Gradle Check (windows-latest)	5m 27s
Grammar Choice Conflicts	28s
Maven Verify (windows-latest)	4m 53s
Maven Verify (ubuntu-latest)	3m 34s
Maven Verify (macos-latest)	4m 50s
Build & Deploy Sphinx Docs	-1s
Gradle Publish (Maven Central)	-1s
	26m 33s