Merge pull request #45 from kingwingfly/examples/enable_some_feature_gates

chore: make the document of the example able to be previewed

Author: BenjaminBrienen

documentation/debugging.md

@@ -6,3 +6,9 @@
   - Alternatively you could install and use [cargo expand](https://github.com/dtolnay/cargo-expand) which adds syntax highlighting to the terminal output.
     - Additionally get pager by piping to `less` ( on Unix systems ): `cargo expand --color always | less -R`
 - Print output during macro compilation using `eprintln!("hi");`
+
+## Preview Doc
+
+```sh
+RUSTDOCFLAGS="--cfg docsrs" cargo +nightly doc --example all_tuples --no-deps --open
+```

examples/demonstrations/all_tuples.rs

@@ -1,5 +1,7 @@
 //! An example of using `all_tuples!`
 
+#![cfg_attr(any(docsrs), feature(rustdoc_internals))]
+
 use variadics_please::all_tuples;
 
 fn main() {}

src/lib.rs

@@ -150,7 +150,6 @@ impl Parse for AllTuples {
 ///
 /// ```
 /// // `rustdoc_internals` is needed for `#[doc(fake_variadics)]`
-/// #![allow(internal_features)]
 /// #![cfg_attr(any(docsrs, docsrs_dep), feature(rustdoc_internals))]
 /// ```
 ///
@@ -377,7 +376,6 @@ pub fn all_tuples_enumerated(input: TokenStream) -> TokenStream {
 ///
 /// ```
 /// // `rustdoc_internals` is needed for `#[doc(fake_variadics)]`
-/// #![allow(internal_features)]
 /// #![cfg_attr(any(docsrs, docsrs_dep), feature(rustdoc_internals))]
 /// ```
 ///