Only allow last extractor to mutate the request (#1272)

* Only allow last extractor to mutate the request

* Change `FromRequest` and add `FromRequestParts` trait (#1275)

* Add `Once`/`Mut` type parameter for `FromRequest` and `RequestParts`

* 🪄

* split traits

* `FromRequest` for tuples

* Remove `BodyAlreadyExtracted`

* don't need fully qualified path

* don't export `Once` and `Mut`

* remove temp tests

* depend on axum again

Co-authored-by: Jonas Platte <[email protected]>

* Port `Handler` and most extractors (#1277)

* Port `Handler` and most extractors

* Put `M` inside `Handler` impls, not trait itself

* comment out tuples for now

* fix lints

* Reorder arguments to `Handler` (#1281)

I think `Request<B>, Arc<S>` is better since its consistent with
`FromRequest` and `FromRequestParts`.

* Port most things in axum-extra (#1282)

* Port `#[derive(TypedPath)]` and `#[debug_handler]` (#1283)

* port #[derive(TypedPath)]

* wip: #[debug_handler]

* fix #[debug_handler]

* don't need itertools

* also require `Send`

* update expected error

* support fully qualified `self`

* Implement FromRequest[Parts] for tuples (#1286)

* Port docs for axum and axum-core (#1285)

* Port axum-extra (#1287)

* Port axum-extra

* Update axum-core/Cargo.toml

Co-authored-by: Jonas Platte <[email protected]>

* remove `impl FromRequest for Either*`

Co-authored-by: Jonas Platte <[email protected]>

* New FromRequest[Parts] trait cleanup (#1288)

* Make private module truly private again

* Simplify tuple FromRequest implementation

* Port `#[derive(FromRequest)]` (#1289)

* fix tests

* fix docs

* revert examples

* fix docs link

* fix intra docs links

* Port examples (#1291)

* Document wrapping other extractors (#1292)

* axum-extra doesn't need to depend on axum-core (#1294)

Missed this in https://github.com/tokio-rs/axum/pull/1287

* Add `FromRequest` changes to changelogs (#1293)

* Update changelog

* Remove default type for `S` in `Handler`

* Clarify which types have default types for `S`

* Apply suggestions from code review

Co-authored-by: Jonas Platte <[email protected]>

Co-authored-by: Jonas Platte <[email protected]>

* remove unused import

* Rename `Mut` and `Once` (#1296)

* fix trybuild expected output

Co-authored-by: Jonas Platte <[email protected]>

axum-core/src/extract/rejection.rs

@@ -1,35 +1,6 @@
 //! Rejection response types.
 
-use crate::{
-    response::{IntoResponse, Response},
-    BoxError,
-};
-use http::StatusCode;
-use std::fmt;
-
-/// Rejection type used if you try and extract the request body more than
-/// once.
-#[derive(Debug, Default)]
-#[non_exhaustive]
-pub struct BodyAlreadyExtracted;
-
-impl BodyAlreadyExtracted {
-    const BODY: &'static str = "Cannot have two request body extractors for a single handler";
-}
-
-impl IntoResponse for BodyAlreadyExtracted {
-    fn into_response(self) -> Response {
-        (StatusCode::INTERNAL_SERVER_ERROR, Self::BODY).into_response()
-    }
-}
-
-impl fmt::Display for BodyAlreadyExtracted {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(f, "{}", Self::BODY)
-    }
-}
-
-impl std::error::Error for BodyAlreadyExtracted {}
+use crate::BoxError;
 
 composite_rejection! {
     /// Rejection type for extractors that buffer the request body. Used if the
@@ -85,7 +56,6 @@ composite_rejection! {
     /// Contains one variant for each way the [`Bytes`](bytes::Bytes) extractor
     /// can fail.
     pub enum BytesRejection {
-        BodyAlreadyExtracted,
         FailedToBufferBody,
     }
 }
@@ -95,7 +65,6 @@ composite_rejection! {
     ///
     /// Contains one variant for each way the [`String`] extractor can fail.
     pub enum StringRejection {
-        BodyAlreadyExtracted,
         FailedToBufferBody,
         InvalidUtf8,
     }