Locate small-stack refusal setup versus planner failure

crates/oa-core/src/language/analysis_source/mixed/project/ordinary_index/rename/tests.rs

@@ -34,7 +34,18 @@ fn renamed(layer: Layer) -> Project {
     p
 }
 fn rejected(bundle: &SourceBundle, desired: &Project, contains: &str) {
-    let e = match authored(bundle).plan_rename(desired) {
+    fn phase(message: &str) {
+        use std::io::Write;
+        let mut stderr = std::io::stderr().lock();
+        writeln!(stderr, "rename rejected helper: {message}").unwrap();
+        stderr.flush().unwrap();
+    }
+    phase("entered; before authored");
+    let source = authored(bundle);
+    phase("after authored; before plan");
+    let result = source.plan_rename(desired);
+    phase("after plan; before result match");
+    let e = match result {
         Ok(_) => panic!("unexpected accepted target"),
         Err(e) => e,
     };