Allow adding a set of cfg's to hide from being implicitly doc(cfg)'d

By adding #![doc(cfg_hide(foobar))] to the crate attributes the cfg
 #[cfg(foobar)] (and _only_ that _exact_ cfg) will not be implicitly
treated as a doc(cfg) to render a message in the documentation.

1 files changed, 32 insertions, 0 deletions

diff --git a/src/test/rustdoc/doc-cfg-hide.rs b/src/test/rustdoc/doc-cfg-hide.rs
new file mode 100644
index 00000000000..b9d0d323137
--- /dev/null
+++ b/src/test/rustdoc/doc-cfg-hide.rs
@@ -0,0 +1,32 @@
+#![crate_name = "oud"]
+#![feature(doc_cfg, doc_cfg_hide)]
+
+#![doc(cfg_hide(feature = "solecism"))]
+
+// @has 'oud/struct.Solecism.html'
+// @count   - '//*[@class="stab portability"]' 0
+// compile-flags:--cfg feature="solecism"
+#[cfg(feature = "solecism")]
+pub struct Solecism;
+
+// @has 'oud/struct.Scribacious.html'
+// @count   - '//*[@class="stab portability"]' 1
+// @matches - '//*[@class="stab portability"]' 'crate feature solecism'
+#[cfg(feature = "solecism")]
+#[doc(cfg(feature = "solecism"))]
+pub struct Scribacious;
+
+// @has 'oud/struct.Hyperdulia.html'
+// @count   - '//*[@class="stab portability"]' 1
+// @matches - '//*[@class="stab portability"]' 'crate feature hyperdulia'
+// compile-flags:--cfg feature="hyperdulia"
+#[cfg(feature = "solecism")]
+#[cfg(feature = "hyperdulia")]
+pub struct Hyperdulia;
+
+// @has 'oud/struct.Oystercatcher.html'
+// @count   - '//*[@class="stab portability"]' 1
+// @matches - '//*[@class="stab portability"]' 'crate features solecism and oystercatcher'
+// compile-flags:--cfg feature="oystercatcher"
+#[cfg(all(feature = "solecism", feature = "oystercatcher"))]
+pub struct Oystercatcher;