Move axum-debug into axum-macros (#724)

* Move axum-debug into axum-macros

* fix ref to axum-macros in changelog

* Apply suggestions from code review

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

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

axum-macros/tests/from_request/pass/named_via.rs

@@ -0,0 +1,58 @@
+use axum::{
+    body::Body,
+    extract::{
+        rejection::{ExtensionRejection, TypedHeaderRejection},
+        Extension, FromRequest, TypedHeader,
+    },
+    headers::{self, UserAgent},
+};
+use axum_macros::FromRequest;
+use std::convert::Infallible;
+
+#[derive(FromRequest)]
+struct Extractor {
+    #[from_request(via(Extension))]
+    state: State,
+    #[from_request(via(TypedHeader))]
+    user_agent: UserAgent,
+    #[from_request(via(TypedHeader))]
+    content_type: headers::ContentType,
+    #[from_request(via(TypedHeader))]
+    etag: Option<headers::ETag>,
+    #[from_request(via(TypedHeader))]
+    host: Result<headers::Host, TypedHeaderRejection>,
+}
+
+fn assert_from_request()
+where
+    Extractor: FromRequest<Body, Rejection = ExtractorRejection>,
+{
+}
+
+fn assert_rejection(rejection: ExtractorRejection)
+where
+    ExtractorRejection: std::fmt::Debug + std::fmt::Display + std::error::Error,
+{
+    match rejection {
+        ExtractorRejection::State(inner) => {
+            let _: ExtensionRejection = inner;
+        }
+        ExtractorRejection::UserAgent(inner) => {
+            let _: TypedHeaderRejection = inner;
+        }
+        ExtractorRejection::ContentType(inner) => {
+            let _: TypedHeaderRejection = inner;
+        }
+        ExtractorRejection::Etag(inner) => {
+            let _: Infallible = inner;
+        }
+        ExtractorRejection::Host(inner) => {
+            let _: Infallible = inner;
+        }
+    }
+}
+
+#[derive(Clone)]
+struct State;
+
+fn main() {}