chore: checkpoint before Python removal

vendor/cfg_aliases/tests/test.rs

@@ -0,0 +1,20 @@
+use cfg_aliases::cfg_aliases;
+
+#[test]
+fn basic_setup() {
+    // Same as in the docs.
+    // Note that tests build this already, but unfortunately this doesn't catch clippy lints!
+    // See https://github.com/rust-lang/rust/issues/56232
+    cfg_aliases! {
+        // Platforms
+        wasm: { target_arch = "wasm32" },
+        android: { target_os = "android" },
+        macos: { target_os = "macos" },
+        linux: { target_os = "linux" },
+        // Backends
+        surfman: { all(unix, feature = "surfman", not(wasm)) },
+        glutin: { all(feature = "glutin", not(wasm)) },
+        wgl: { all(windows, feature = "wgl", not(wasm)) },
+        dummy: { not(any(wasm, glutin, wgl, surfman)) },
+    };
+}