Add "global" rustdoc test for RFC 3631

Author: GuillaumeGomez

tests/rustdoc/doc_auto_cfg.rs

@@ -0,0 +1,80 @@
+// Test covering RFC 3631 features.
+
+#![crate_name = "foo"]
+#![feature(no_core)]
+#![no_core]
+#![no_std]
+
+#![doc(auto_cfg(hide(feature = "hidden")))]
+
+//@ has 'foo/index.html'
+//@ !has - '//*[@class="stab portability"]' 'Non-moustache'
+//@ has - '//*[@class="stab portability"]' 'Non-pistache'
+//@ count - '//*[@class="stab portability"]' 1
+
+//@ has 'foo/m/index.html'
+//@ count - '//*[@title="Available on non-crate feature `hidden` only"]' 2
+#[cfg(not(feature = "hidden"))]
+pub mod m {
+    //@ count 'foo/m/struct.A.html' '//*[@class="stab portability"]' 0
+    pub struct A;
+
+    //@ has 'foo/m/inner/index.html' '//*[@class="stab portability"]' 'Available on non-crate feature hidden only.'
+    #[doc(auto_cfg(show(feature = "hidden")))]
+    pub mod inner {
+        //@ has 'foo/m/inner/struct.B.html' '//*[@class="stab portability"]' 'Available on non-crate feature hidden only.'
+        pub struct B;
+
+        //@ count 'foo/m/inner/struct.A.html' '//*[@class="stab portability"]' 0
+        #[doc(auto_cfg(hide(feature = "hidden")))]
+        pub struct A;
+    }
+
+    //@ has 'foo/m/struct.B.html' '//*[@class="stab portability"]' 'Available on non-crate feature hidden only.'
+    #[doc(auto_cfg(show(feature = "hidden")))]
+    pub struct B;
+}
+
+//@ count 'foo/n/index.html' '//*[@title="Available on non-crate feature `moustache` only"]' 3
+//@ count - '//dl/dt' 4
+#[cfg(not(feature = "moustache"))]
+#[doc(auto_cfg = false)]
+pub mod n {
+    // Should not have `moustache` listed.
+    //@ count 'foo/n/struct.X.html' '//*[@class="stab portability"]' 0
+    pub struct X;
+
+    // Should re-enable `auto_cfg` and make `moustache` listed.
+    //@ has 'foo/n/struct.Y.html' '//*[@class="stab portability"]' \
+    //  'Available on non-crate feature moustache only.'
+    #[doc(auto_cfg)]
+    pub struct Y;
+
+    // Should re-enable `auto_cfg` and make `moustache` listed for itself
+    // and for `Y`.
+    //@ has 'foo/n/inner/index.html' '//*[@class="stab portability"]' \
+    //  'Available on non-crate feature moustache only.'
+    #[doc(auto_cfg = true)]
+    pub mod inner {
+        //@ has 'foo/n/inner/struct.Y.html' '//*[@class="stab portability"]' \
+        //  'Available on non-crate feature moustache only.'
+        pub struct Y;
+    }
+
+    // Should re-enable `auto_cfg` and make `moustache` listed.
+    //@ has 'foo/n/struct.Z.html' '//*[@class="stab portability"]' \
+    //  'Available on non-crate feature moustache only.'
+    #[doc(auto_cfg(hide(feature = "hidden")))]
+    pub struct Z;
+}
+
+// Checking inheritance.
+//@ has 'foo/o/index.html' '//*[@class="stab portability"]' \
+//  'Available on non-crate feature pistache only.'
+#[doc(cfg(not(feature = "pistache")))]
+pub mod o {
+    //@ has 'foo/o/struct.A.html' '//*[@class="stab portability"]' \
+    //  'Available on non-crate feature pistache and non-crate feature tarte only.'
+    #[doc(cfg(not(feature = "tarte")))]
+    pub struct A;
+}