Fix is_test_module_or_function

Author: smoelius

clippy_utils/src/lib.rs

@@ -2505,8 +2505,9 @@ fn with_test_item_names(tcx: TyCtxt<'_>, module: LocalModDefId, f: impl Fn(&[Sym
 /// Note: Add `//@compile-flags: --test` to UI tests with a `#[test]` function
 pub fn is_in_test_function(tcx: TyCtxt<'_>, id: HirId) -> bool {
     with_test_item_names(tcx, tcx.parent_module(id), |names| {
-        tcx.hir()
-            .parent_iter(id)
+        let node = tcx.hir_node(id);
+        once((id, node))
+            .chain(tcx.hir().parent_iter(id))
             // Since you can nest functions we need to collect all until we leave
             // function scope
             .any(|(_id, node)| {