debug_handler macro is incompatible with use of #![deny(unreachable_code)]

[taladar]

• I have looked for existing issues (including closed) about this

Bug Report

Version

├── axum v0.6.18
│   ├── axum-core v0.3.4
│   ├── axum-macros v0.3.7 (proc-macro)
├── axum-extra v0.7.4
│   ├── axum v0.6.18 (*)
│   ├── axum-core v0.3.4 (*)
│   ├── axum-macros v0.3.7 (proc-macro) (*)
├── axum-server v0.5.0
├── axum_session v0.2.2
│   ├── axum-core v0.3.4 (*)
├── axum_session_auth v0.2.1
│   ├── axum-core v0.3.4 (*)
│   ├── axum_session v0.2.2 (*)
    ├── axum v0.6.18 (*)
├── axum-test-helper v0.2.0
│   ├── axum v0.6.18 (*)

Platform

Linux hostname-removed 6.2.12 #124 SMP PREEMPT_DYNAMIC Fri Apr 21 10:31:26 CEST 2023 x86_64 AMD Ryzen 9 3900X 12-Core Processor AuthenticAMD GNU/Linux

Crates

axum-macros

Description

I tried adding

#[debug_handler]

to my handler functions and got a compiler error due to

#![deny(unreachable_code)]

error: unreachable statement
  --> src/handler/example.rs:48:1
   |
48 | #[debug_handler]
   | ^^^^^^^^^^^^^^^^
   | |
   | unreachable statement
   | any code following this expression is unreachable
   |

error: unreachable expression
  --> src/handler/example.rs:49:10
   |
49 | async fn list_examples(_: ListExamplesEndpoint, Extension(_database_pool) : Extension<PgPool>) -> Result<Json<Vec<Example>>, crate::Error> {
   |          ^^^^^^^^^^^^^
   |          |
   |          unreachable expression
   |          any code following this expression is unreachable
   |
   = note: this error originates in the macro `$crate::panic::panic_2021` which comes from the expansion of the macro `panic` (in Nightly builds, run with -Z macro-backtrace for more info)

Trying an

#[allow(unreachable_code)]

above the macro did not solve the problem.

[davidpdrsn]

Thanks for the report! Should just be a matter of adding #[allow(unreachable_code)] to the generated functions.