[#YANGTOOLS-1381] Parser reactor does not support chained prerequisites

If an inference action attempts to create another inference on the same statement (and the same stage), we end up throwing:

Thread [main] (Suspended (exception ConcurrentModificationException))
	HashMap$KeyIterator(HashMap$HashIterator).remove() line: 1525
	AbstractMapBasedMultimap$WrappedCollection$WrappedIterator.remove() line: 468
	SourceSpecificContext.tryToProgress(Collection<ModifierImpl>) line: 329
	SourceSpecificContext.tryToCompletePhase(byte) line: 301
	BuildGlobalContext.completePhaseActions() line: 364
	BuildGlobalContext.executePhases() line: 199
	BuildGlobalContext.buildEffective() line: 210
	CrossSourceStatementReactor$BuildAction.buildEffective() line: 219
	YT1338Test.testAddedLeaves() line: 18

This is because we are iterating over the values and the inference action adds a new one – a classic CME.

[YANGTOOLS-1381] Parser reactor does not support chained prerequisites Created: 12/Dec/21 Updated: 13/Dec/21 Resolved: 13/Dec/21
Status:	Resolved
Project:	yangtools
Component/s:	parser
Affects Version/s:	None
Fix Version/s:	8.0.0, 7.0.10

[YANGTOOLS-1381] Parser reactor does not support chained prerequisites Created: 12/Dec/21 Updated: 13/Dec/21 Resolved: 13/Dec/21