Add staged_api for tests

Author: jsha

src/test/rustdoc-gui/headings.goml

@@ -154,3 +154,16 @@ assert-css: ("h2#top-doc-prose-title", {"font-size": "20.8px"})
 assert-css: ("h2#top-doc-prose-title", {"border-bottom-width": "1px"})
 assert-css: ("h3#top-doc-prose-sub-heading", {"font-size": "18.4px"})
 assert-css: ("h3#top-doc-prose-sub-heading", {"border-bottom-width": "1px"})
+
+goto: file://|DOC_PATH|/staged_api/struct.Foo.html
+show-text: true
+local-storage: {"rustdoc-theme": "light", "rustdoc-use-system-theme": "false"}
+assert-css: (".since", {"color": "rgb(128, 128, 128)"})
+
+local-storage: {"rustdoc-theme": "dark", "rustdoc-use-system-theme": "false"}
+reload:
+assert-css: (".since", {"color": "rgb(128, 128, 128)"})
+
+local-storage: {"rustdoc-theme": "ayu", "rustdoc-use-system-theme": "false"}
+reload:
+assert-css: (".since", {"color": "rgb(128, 128, 128)"})

src/test/rustdoc-gui/src/staged_api/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "staged_api"
+version = "0.1.0"

src/test/rustdoc-gui/src/staged_api/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "staged_api"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+path = "lib.rs"
+
+[features]
+default = ["some_feature"]
+some_feature = []

src/test/rustdoc-gui/src/staged_api/lib.rs

@@ -0,0 +1,10 @@
+#![feature(staged_api)]
+#![stable(feature = "some_feature", since = "1.3.5")]
+
+#[stable(feature = "some_feature", since = "1.3.5")]
+pub struct Foo {}
+
+impl Foo {
+    #[stable(feature = "some_feature", since = "1.3.5")]
+    pub fn bar() {}
+}