Add special handling of FromRequest extractors not being the last arg (#1797)

axum-macros/tests/debug_handler/fail/doesnt_implement_from_request_parts.rs

@@ -1,7 +0,0 @@
-use axum_macros::debug_handler;
-use axum::http::Method;
-
-#[debug_handler]
-async fn handler(_: String, _: Method) {}
-
-fn main() {}

axum-macros/tests/debug_handler/fail/doesnt_implement_from_request_parts.stderr

@@ -1,20 +0,0 @@
-error[E0277]: the trait bound `String: FromRequestParts<()>` is not satisfied
- --> tests/debug_handler/fail/doesnt_implement_from_request_parts.rs:5:21
-  |
-5 | async fn handler(_: String, _: Method) {}
-  |                     ^^^^^^ the trait `FromRequestParts<()>` is not implemented for `String`
-  |
-  = note: Function argument is not a valid axum extractor.
-          See `https://docs.rs/axum/latest/axum/extract/index.html` for details
-  = help: the following other types implement trait `FromRequestParts<S>`:
-            <() as FromRequestParts<S>>
-            <(T1, T2) as FromRequestParts<S>>
-            <(T1, T2, T3) as FromRequestParts<S>>
-            <(T1, T2, T3, T4) as FromRequestParts<S>>
-            <(T1, T2, T3, T4, T5) as FromRequestParts<S>>
-            <(T1, T2, T3, T4, T5, T6) as FromRequestParts<S>>
-            <(T1, T2, T3, T4, T5, T6, T7) as FromRequestParts<S>>
-            <(T1, T2, T3, T4, T5, T6, T7, T8) as FromRequestParts<S>>
-          and 26 others
-  = help: see issue #48214
-  = help: add `#![feature(trivial_bounds)]` to the crate attributes to enable

axum-macros/tests/debug_handler/fail/multiple_request_consumers.rs

@@ -0,0 +1,10 @@
+use axum_macros::debug_handler;
+use axum::{Json, body::Bytes, http::{Method, Uri}};
+
+#[debug_handler]
+async fn one(_: Json<()>, _: String, _: Uri) {}
+
+#[debug_handler]
+async fn two(_: Json<()>, _: Method, _: Bytes, _: Uri, _: String) {}
+
+fn main() {}

axum-macros/tests/debug_handler/fail/multiple_request_consumers.stderr

@@ -0,0 +1,11 @@
+error: Can't have two extractors that consume the request body. `Json<_>` and `String` both do that.
+ --> tests/debug_handler/fail/multiple_request_consumers.rs:5:14
+  |
+5 | async fn one(_: Json<()>, _: String, _: Uri) {}
+  |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: Can't have more than one extractor that consume the request body. `Json<_>`, `Bytes`, and `String` all do that.
+ --> tests/debug_handler/fail/multiple_request_consumers.rs:8:14
+  |
+8 | async fn two(_: Json<()>, _: Method, _: Bytes, _: Uri, _: String) {}
+  |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

axum-macros/tests/debug_handler/fail/wrong_order.rs

@@ -0,0 +1,10 @@
+use axum_macros::debug_handler;
+use axum::{Json, http::Uri};
+
+#[debug_handler]
+async fn one(_: Json<()>, _: Uri) {}
+
+#[debug_handler]
+async fn two(_: String, _: Uri) {}
+
+fn main() {}

axum-macros/tests/debug_handler/fail/wrong_order.stderr

@@ -0,0 +1,11 @@
+error: `Json<_>` consumes the request body and thus must be the last argument to the handler function
+ --> tests/debug_handler/fail/wrong_order.rs:5:17
+  |
+5 | async fn one(_: Json<()>, _: Uri) {}
+  |                 ^^^^^^^^
+
+error: `String` consumes the request body and thus must be the last argument to the handler function
+ --> tests/debug_handler/fail/wrong_order.rs:8:17
+  |
+8 | async fn two(_: String, _: Uri) {}
+  |                 ^^^^^^