public StructuredBlock prevCase(StructuredBlock block) {
		for (int i = caseBlocks.length - 1; i >= 0; i--) {
			if (caseBlocks[i].subBlock == block) {
				for (i--; i >= 0; i--) {
					if (caseBlocks[i].subBlock != null)
						return caseBlocks[i].subBlock;
				}
			}
		}
		return null;
	}