Add test for trait object safety

Author: GuillaumeGomez

src/test/rustdoc/trait-object-safe.rs

@@ -0,0 +1,23 @@
+#![crate_name = "foo"]
+
+// @has 'foo/trait.Safe.html'
+// @has - '//*[@class="obj-info"]' 'This trait is object safe.'
+pub trait Safe {
+    fn foo(&self);
+}
+
+// @has 'foo/trait.Unsafe.html'
+// @has - '//*[@class="obj-info"]' 'This trait is not object safe.'
+pub trait Unsafe {
+    fn foo() -> Self;
+}
+
+// @has 'foo/trait.Unsafe2.html'
+// @has - '//*[@class="obj-info"]' 'This trait is not object safe.'
+pub trait Unsafe2<T> {
+    fn foo(i: T);
+}
+
+// @has 'foo/struct.Foo.html'
+// @!has - '//*[@class="obj-info"]'
+pub struct Foo;