Add doc_cfg attribute

sailfish/Cargo.toml

@@ -28,3 +28,7 @@ optional = true
 
 [build-dependencies]
 version_check = "0.9.2"
+
+[package.metadata.docs.rs]
+all-features = true
+rustdoc-args = ["--cfg", "docsrs"]

sailfish/src/lib.rs

@@ -32,12 +32,14 @@
     html_logo_url = "https://raw.githubusercontent.com/Kogia-sima/sailfish/master/resources/icon.png"
 )]
 #![cfg_attr(sailfish_nightly, feature(core_intrinsics))]
+#![cfg_attr(docsrs, feature(doc_cfg))]
 
 pub mod runtime;
 
 use runtime::Buffer;
 pub use runtime::{RenderError, RenderResult};
 #[cfg(feature = "derive")]
+#[cfg_attr(docsrs, doc(cfg(feature = "derive")))]
 pub use sailfish_macros::TemplateOnce;
 
 /// Template that can be rendered with consuming itself.