ValidationException.errors() are ErrorDetails

Update the documentation to explain that `RequestValidationError` isn't
literally a subclass since Pydantic V2.

docs/en/docs/tutorial/handling-errors.md

@@ -163,7 +163,7 @@ path -> item_id
 !!! warning
     These are technical details that you might skip if it's not important for you now.
 
-`RequestValidationError` is a sub-class of Pydantic's <a href="https://docs.pydantic.dev/latest/concepts/models/#error-handling" class="external-link" target="_blank">`ValidationError`</a>.
+`RequestValidationError` is morally a sub-class of Pydantic's <a href="https://docs.pydantic.dev/latest/concepts/models/#error-handling" class="external-link" target="_blank">`ValidationError`</a>.
 
 **FastAPI** uses it so that, if you use a Pydantic model in `response_model`, and your data has an error, you will see the error in your log.
 

fastapi/exceptions.py

@@ -1,6 +1,7 @@
 from typing import Any, Dict, Optional, Sequence, Type, Union
 
 from pydantic import BaseModel, create_model
+from pydantic_core import ErrorDetails
 from starlette.exceptions import HTTPException as StarletteHTTPException
 from starlette.exceptions import WebSocketException as StarletteWebSocketException
 from typing_extensions import Annotated, Doc
@@ -147,15 +148,15 @@ class FastAPIError(RuntimeError):
 
 
 class ValidationException(Exception):
-    def __init__(self, errors: Sequence[Any]) -> None:
+    def __init__(self, errors: Sequence[ErrorDetails]) -> None:
         self._errors = errors
 
-    def errors(self) -> Sequence[Any]:
+    def errors(self) -> Sequence[ErrorDetails]:
         return self._errors
 
 
 class RequestValidationError(ValidationException):
-    def __init__(self, errors: Sequence[Any], *, body: Any = None) -> None:
+    def __init__(self, errors: Sequence[ErrorDetails], *, body: Any = None) -> None:
         super().__init__(errors)
         self.body = body
 
@@ -165,7 +166,7 @@ class WebSocketRequestValidationError(ValidationException):
 
 
 class ResponseValidationError(ValidationException):
-    def __init__(self, errors: Sequence[Any], *, body: Any = None) -> None:
+    def __init__(self, errors: Sequence[ErrorDetails], *, body: Any = None) -> None:
         super().__init__(errors)
         self.body = body