From 7d67c71c34610b70babdcde786ec7217e6a2582b Mon Sep 17 00:00:00 2001
From: Jonas Schievink <jonasschievink@gmail.com>
Date: Sun, 5 Sep 2021 19:19:34 +0200
Subject: [PATCH] Add panic info for `impl_trait`/`trait_data`

---
 crates/hir_def/src/data.rs | 8 ++++++++
 crates/hir_ty/src/lower.rs | 4 ++++
 2 files changed, 12 insertions(+)

diff --git a/crates/hir_def/src/data.rs b/crates/hir_def/src/data.rs
index c63e9311ab..3a3709f8f8 100644
--- a/crates/hir_def/src/data.rs
+++ b/crates/hir_def/src/data.rs
@@ -154,6 +154,10 @@ impl TraitData {
         let tr_loc = tr.lookup(db);
         let item_tree = tr_loc.id.item_tree(db);
         let tr_def = &item_tree[tr_loc.id.value];
+        let _cx = stdx::panic_context::enter(format!(
+            "trait_data_query({:?} -> {:?} -> {:?})",
+            tr, tr_loc, tr_def
+        ));
         let name = tr_def.name.clone();
         let is_auto = tr_def.is_auto;
         let is_unsafe = tr_def.is_unsafe;
@@ -341,6 +345,10 @@ fn collect_items(
                 let ast_id_map = db.ast_id_map(tree_id.file_id());
                 let root = db.parse_or_expand(tree_id.file_id()).unwrap();
                 let call = ast_id_map.get(call.ast_id).to_node(&root);
+                let _cx = stdx::panic_context::enter(format!(
+                    "collect_items MacroCall: {}\nexpander={:#?}",
+                    call, expander
+                ));
                 let res = expander.enter_expand(db, call);
 
                 if let Ok(res) = res {
diff --git a/crates/hir_ty/src/lower.rs b/crates/hir_ty/src/lower.rs
index 0e1afe866e..176ae3ad84 100644
--- a/crates/hir_ty/src/lower.rs
+++ b/crates/hir_ty/src/lower.rs
@@ -1450,6 +1450,10 @@ pub(crate) fn impl_self_ty_recover(
 pub(crate) fn impl_trait_query(db: &dyn HirDatabase, impl_id: ImplId) -> Option<Binders<TraitRef>> {
     let impl_data = db.impl_data(impl_id);
     let resolver = impl_id.resolver(db.upcast());
+    let _cx = stdx::panic_context::enter(format!(
+        "impl_trait_query({:?} -> {:?}) resolver={:#?}",
+        impl_id, impl_data, resolver
+    ));
     let ctx =
         TyLoweringContext::new(db, &resolver).with_type_param_mode(TypeParamLoweringMode::Variable);
     let (self_ty, binders) = db.impl_self_ty(impl_id).into_value_and_skipped_binders();