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Add an option to stop treating blank lines as a statement separator #1249

Job	Run time
Gradle Check (ubuntu-latest)	3m 50s
Grammar Choice Conflicts	28s
Gradle Check (windows-latest)	4m 50s
Gradle Check (macos-latest)	4m 36s
Maven Verify (macos-latest)	4m 50s
Maven Verify (ubuntu-latest)	2m 41s
Maven Verify (windows-latest)	5m 41s
Gradle Publish (Maven Central)	0s
Build & Deploy Sphinx Docs	0s
	26m 56s