Add tests for --generate-redirect-map option

src/test/rustdoc/redirect-map-empty.rs

@@ -0,0 +1,6 @@
+// compile-flags: -Z unstable-options --generate-redirect-map
+
+#![crate_name = "foo"]
+
+// @!has foo/redirect-map.json
+pub struct Foo;

src/test/rustdoc/redirect-map.rs

@@ -0,0 +1,23 @@
+// compile-flags: -Z unstable-options --generate-redirect-map
+
+#![crate_name = "foo"]
+
+// @!has foo/private/struct.Quz.html
+// @!has foo/hidden/struct.Bar.html
+// @has foo/redirect-map.json
+pub use private::Quz;
+pub use hidden::Bar;
+
+mod private {
+    pub struct Quz;
+}
+
+#[doc(hidden)]
+pub mod hidden {
+    pub struct Bar;
+}
+
+#[macro_export]
+macro_rules! foo {
+  () => {}
+}