CFGBuilder (@NotNull PsiExpression expression, @Nullable NullabilityProblemKind<? super PsiExpression> kind) { if (kind == null) { return pushExpression(expression); } myAnalyzer.addCustomNullabilityProblem(expression, kind); expression.accept(myAnalyzer); myAnalyzer.removeCustomNullabilityProblem(expression); return this; }