rustdoc: add test case for auto traits on slice primitive

Author: notriddle

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

@@ -0,0 +1,14 @@
+// compile-flags: --crate-type lib --edition 2018
+
+#![crate_name = "foo"]
+#![feature(rustdoc_internals)]
+
+// @has foo/primitive.slice.html '//a[@class="primitive"]' 'slice'
+// @has - '//span[@class="in-band"]' 'Primitive Type slice'
+// @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<T> Send for [T] where T: Send'
+// @has - '//div[@id="synthetic-implementations-list"]//h3' 'impl<T> Sync for [T] where T: Sync'
+#[doc(primitive = "slice")]
+/// this is a test!
+mod slice_prim {}