rustdoc: show auto/blanket docs for tuple and unit

Author: notriddle

library/core/src/primitive_docs.rs

@@ -439,6 +439,11 @@ mod prim_char {}
 #[stable(feature = "rust1", since = "1.0.0")]
 mod prim_unit {}
 
+// Required to make auto trait impls render.
+// See /src/librustdoc/passes/collect_trait_impls.rs:collect_trait_impls
+#[doc(hidden)]
+impl () {}
+
 #[doc(primitive = "pointer")]
 #[doc(alias = "ptr")]
 #[doc(alias = "*")]
@@ -949,6 +954,11 @@ mod prim_str {}
 #[stable(feature = "rust1", since = "1.0.0")]
 mod prim_tuple {}
 
+// Required to make auto trait impls render.
+// See /src/librustdoc/passes/collect_trait_impls.rs:collect_trait_impls
+#[doc(hidden)]
+impl<T, U> (T, U) {}
+
 #[doc(primitive = "f32")]
 /// A 32-bit floating point type (specifically, the "binary32" type defined in IEEE 754-2008).
 ///

library/std/src/primitive_docs.rs

@@ -439,6 +439,11 @@ mod prim_char {}
 #[stable(feature = "rust1", since = "1.0.0")]
 mod prim_unit {}
 
+// Required to make auto trait impls render.
+// See /src/librustdoc/passes/collect_trait_impls.rs:collect_trait_impls
+#[doc(hidden)]
+impl () {}
+
 #[doc(primitive = "pointer")]
 #[doc(alias = "ptr")]
 #[doc(alias = "*")]
@@ -949,6 +954,11 @@ mod prim_str {}
 #[stable(feature = "rust1", since = "1.0.0")]
 mod prim_tuple {}
 
+// Required to make auto trait impls render.
+// See /src/librustdoc/passes/collect_trait_impls.rs:collect_trait_impls
+#[doc(hidden)]
+impl<T, U> (T, U) {}
+
 #[doc(primitive = "f32")]
 /// A 32-bit floating point type (specifically, the "binary32" type defined in IEEE 754-2008).
 ///

src/test/rustdoc/primitive-tuple-auto-trait.rs

@@ -0,0 +1,14 @@
+// compile-flags: --crate-type lib --edition 2018
+
+#![crate_name = "foo"]
+#![feature(rustdoc_internals)]
+
+// @has foo/primitive.tuple.html '//a[@class="primitive"]' 'tuple'
+// @has - '//span[@class="in-band"]' 'Primitive Type tuple'
+// @has - '//section[@id="main-content"]//div[@class="docblock"]//p' 'this is a test!'
+// @has - '//h2[@id="synthetic-implementations"]' 'Auto Trait Implementations'
+// @has - '//div[@id="synthetic-implementations-list"]//h3' 'Send'
+// @has - '//div[@id="synthetic-implementations-list"]//h3' 'Sync'
+#[doc(primitive = "tuple")]
+/// this is a test!
+mod tuple_prim {}

src/test/rustdoc/primitive-unit-auto-trait.rs

@@ -0,0 +1,14 @@
+// compile-flags: --crate-type lib --edition 2018
+
+#![crate_name = "foo"]
+#![feature(rustdoc_internals)]
+
+// @has foo/primitive.unit.html '//a[@class="primitive"]' 'unit'
+// @has - '//span[@class="in-band"]' 'Primitive Type unit'
+// @has - '//section[@id="main-content"]//div[@class="docblock"]//p' 'this is a test!'
+// @has - '//h2[@id="synthetic-implementations"]' 'Auto Trait Implementations'
+// @has - '//div[@id="synthetic-implementations-list"]//h3' 'impl Send for ()'
+// @has - '//div[@id="synthetic-implementations-list"]//h3' 'impl Sync for ()'
+#[doc(primitive = "unit")]
+/// this is a test!
+mod unit_prim {}