docs: private Description doUnboxingCheck(VisitorState state, ExpressionTree... expressions) {
      for (ExpressionTree tree : expressions) {
        Type type = ASTHelpers.getType(tree);
        if (type == null) {
          throw new RuntimeException("was not expecting null type");
        }
        if (!type.isPrimitive()) {
          if (mayBeNullExpr(state, tree)) {
            final ErrorMessage errorMessage =
                new ErrorMessage(MessageTypes.UNBOX_NULLABLE, "unboxing of a @Nullable value");
            return errorBuilder.createErrorDescription(
                errorMessage, state.getPath(), buildDescription(tree));
          }
        }
      }
      return Description.NO_MATCH;
    }