@Override public PType caseAClassInvariantDefinition(AClassInvariantDefinition node, TypeCheckInfo question) throws AnalysisException { Environment newEnv = new FlatEnvironment(question.assistantFactory, question.env, true); newEnv.setEnclosingDefinition(node); TypeCheckInfo functional = question.newInfo(newEnv); functional.qualifiers = null; functional.scope = NameScope.NAMESANDSTATE; PType type = node.getExpression().apply(THIS, functional); if (!question.assistantFactory.createPTypeAssistant().isType(type, ABooleanBasicType.class)) { TypeCheckerErrors.report(3013, "Class invariant is not a boolean expression", node.getLocation(), node); } node.setType(type); return node.getType(); }