Fix build with form feature without headers feature (#1107)

Fixes #1106

axum/CHANGELOG.md

@@ -7,7 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 # Unreleased
 
-- None.
+- **fixed:** Fix compile error when the `headers` is enabled and the `form`
+  feature is disabled
 
 # 0.5.8 (18. June, 2022)
 

axum/src/lib.rs

@@ -437,8 +437,8 @@ pub use self::routing::Router;
 pub use self::typed_header::TypedHeader;
 
 #[doc(inline)]
-#[cfg(feature = "headers")]
-pub use form::Form;
+#[cfg(feature = "form")]
+pub use self::form::Form;
 
 #[doc(inline)]
 pub use axum_core::{BoxError, Error};