}

      boolean isNullableTypeVariable(Type type) {
        if (!(type instanceof TypeVariable)) {
          return false;
        }
        TypeVariable<?> typeVar = (TypeVariable<?>) type;
        for (AnnotatedType bound : typeVar.getAnnotatedBounds()) {
          // Until Java 15, the isNullableTypeVariable case here won't help:
          // https://bugs.openjdk.java.net/browse/JDK-8202469

from enum import Enum
from typing import (
    Any,
    Awaitable,
    Callable,
    Coroutine,
    Dict,
    List,
    Optional,
    Sequence,
    Type,
    TypeVar,
    Union,
)

from fastapi import routing
from fastapi.datastructures import Default, DefaultPlaceholder
from fastapi.exception_handlers import (
    http_exception_handler,
    request_validation_exception_handler,