Derive `TypedPath` not work when `OptionalFromRequestParts` in scope

[azureqaq]

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

Bug Report

Version

• rustc 1.93.0 (254b59607 2026-01-19)
• axum v0.8.8
• axum-extra v0.12.5
• axum-macros v0.5.0 (proc-macro)

Platform

macOS arm64 26.2 Apple M1

Crates

• axum-extra v0.12.5

Description

Importing OptionalFromRequestParts while using #[derive(TypedPath, Deserialize)] will cause a compilation error.

I tried this code:

use axum::extract::OptionalFromRequestParts; // If you comment out this line, it will compile normally.
use axum_extra::routing::TypedPath;
use serde::Deserialize;

#[derive(Debug, Deserialize, TypedPath)]
#[typed_path("/mypath/{inner}")]
pub struct MyPath {
    inner: String,
}

Error message:

error[E0034]: multiple applicable items in scope
 --> src/lib.rs:5:30
  |
5 | #[derive(Debug, Deserialize, TypedPath)]
  |                              ^^^^^^^^^ multiple `from_request_parts` found
  |
  = note: candidate #1 is defined in an impl of the trait `FromRequestParts` for the type `axum::extract::Path<T>`
  = note: candidate #2 is defined in an impl of the trait `OptionalFromRequestParts` for the type `axum::extract::Path<T>`
  = note: this error originates in the derive macro `TypedPath` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0282]: type annotations needed
 --> src/lib.rs:5:30
  |
5 | #[derive(Debug, Deserialize, TypedPath)]
  |                              ^^^^^^^^^ cannot infer type
  |
  = note: this error originates in the derive macro `TypedPath` (in Nightly builds, run with -Z macro-backtrace for more info)

Some errors have detailed explanations: E0034, E0282.
For more information about an error, try `rustc --explain E0034`.
error: could not compile `ttt` (lib) due to 2 previous errors

[azureqaq]

fixed by #3645