Fix building cargo-examples after stabilization of #cfg(doc)

`rustdoc` is now just `doc` and no longer requires unstable features.
This raises the MSRV for building cargo-examples's documentationto
1.41.0.
See rust-lang/rust#61351

Fixes #101

CHANGELOG.md

@@ -11,6 +11,10 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 ### Changed
 ### Fixed
+
+- Fixed the docs for `mockall_examples`
+  ([#103](https://github.com/asomers/mockall/pull/103))
+
 ### Removed
 
 ## [0.6.0] - 5 December 2019

mockall_examples/Cargo.toml

@@ -12,12 +12,5 @@ description = """
 Examples of autogenerated mock objects by Mockall
 """
 
-[package.metadata.docs.rs]
-features = ["nightly-docs"]
-
-[features]
-# For building documentation only; no functional change to the library.
-nightly-docs = []
-
 [dependencies]
 mockall = { version = "= 0.6.0", path = "../mockall" }

mockall_examples/src/lib.rs

@@ -1,5 +1,4 @@
 // vim: tw=80
-#![cfg_attr(feature = "nightly-docs", feature(doc_cfg))]
 
 //! Examples of mock objects and their generated methods.
 //!
@@ -8,13 +7,13 @@
 //! crate.  You should never depend on this crate.
 //
 
-#[cfg(all(feature = "nightly-docs", rustdoc))]
+#[cfg(doc)]
 use mockall::*;
 
 /// A basic trait with several kinds of method.
 ///
 /// It is mocked by the [`MockFoo`](struct.MockFoo.html) struct.
-#[cfg(all(feature = "nightly-docs", rustdoc))]
+#[cfg(doc)]
 #[automock]
 pub trait Foo {
     /// A method with a `'static` return type
@@ -33,7 +32,7 @@ pub trait Foo {
     fn bang(x: i32) -> i32;
 }
 
-#[cfg(all(feature = "nightly-docs", rustdoc))]
+#[cfg(doc)]
 #[automock(mod mock_ffi;)]
 extern "C" {
     /// A foreign "C" function