Add tests for impl restriction rendering

Author: CoCo-Japan-pan

tests/rustdoc-html/impl/impl-restriction-document-private.rs

@@ -0,0 +1,15 @@
+//@ compile-flags: --document-private-items
+#![crate_name = "c"]
+#![feature(impl_restriction)]
+
+//@ matches c/trait.Foo.html '//*[@class="stab impl_restriction"]' \
+//      'This trait cannot be implemented outside c.$'
+//@ has c/trait.Foo.html '//*[@class="stab impl_restriction"]//code' 'c'
+pub impl(crate) trait Foo {}
+
+pub mod inner {
+    //@ matches c/inner/trait.Bar.html '//*[@class="stab impl_restriction"]' \
+    //      'This trait cannot be implemented outside c::inner.$'
+    //@ has c/inner/trait.Bar.html '//*[@class="stab impl_restriction"]//code' 'c::inner'
+    pub impl(self) trait Bar {}
+}

tests/rustdoc-html/impl/impl-restriction.rs

@@ -0,0 +1,14 @@
+#![crate_name = "c"]
+#![feature(impl_restriction)]
+
+//@ matches c/trait.Foo.html '//*[@class="stab impl_restriction"]' \
+//      'This trait cannot be implemented outside c.$'
+//@ has c/trait.Foo.html '//*[@class="stab impl_restriction"]//code' 'c'
+pub impl(crate) trait Foo {}
+
+pub mod inner {
+    //@ matches c/inner/trait.Bar.html '//*[@class="stab impl_restriction"]' \
+    //      'This trait cannot be implemented outside c.$'
+    //@ has c/inner/trait.Bar.html '//*[@class="stab impl_restriction"]//code' 'c'
+    pub impl(self) trait Bar {}
+}