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Improve the error message for state type inference failure in FromRequest(Parts) derive macro (#1432)

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* Add a dedicated error message for state type inference issues

* Generate valid code even if state type can't be inferred

* Also error on state type inference for debug_handler
This commit is contained in:
Jonas Platte
2022-10-09 20:25:05 +02:00
committed by GitHub
parent ee0b71a4ac
commit 7cbacd1433
4 changed files with 134 additions and 107 deletions
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axum-macros/tests/from_request/fail/state_infer_multiple_different_types.stderr
+5 -21
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@@ -1,23 +1,7 @@
error[E0277]: the trait bound `AppState: FromRef<S>` is not satisfied
--> tests/from_request/fail/state_infer_multiple_different_types.rs:6:18
error: can't infer state type, please add `#[from_request(state = MyStateType)]` attribute
--> tests/from_request/fail/state_infer_multiple_different_types.rs:4:10
|
6 | inner_state: State<AppState>,
| ^^^^^ the trait `FromRef<S>` is not implemented for `AppState`
4 | #[derive(FromRequest)]
| ^^^^^^^^^^^
|
= note: required because of the requirements on the impl of `FromRequestParts<S>` for `State<AppState>`
help: consider extending the `where` clause, but there might be an alternative better way to express this requirement
|
4 | #[derive(FromRequest, AppState: FromRef<S>)]
| ++++++++++++++++++++++
error[E0277]: the trait bound `OtherState: FromRef<S>` is not satisfied
--> tests/from_request/fail/state_infer_multiple_different_types.rs:7:18
|
7 | other_state: State<OtherState>,
| ^^^^^ the trait `FromRef<S>` is not implemented for `OtherState`
|
= note: required because of the requirements on the impl of `FromRequestParts<S>` for `State<OtherState>`
help: consider extending the `where` clause, but there might be an alternative better way to express this requirement
|
4 | #[derive(FromRequest, OtherState: FromRef<S>)]
| ++++++++++++++++++++++++
= note: this error originates in the derive macro `FromRequest` (in Nightly builds, run with -Z macro-backtrace for more info)