Add some FIXMEs for follow-up PRs

Author: fmease

Diff for: compiler/rustc_hir_analysis/src/astconv/errors.rs

@@ -291,6 +291,12 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
         fulfillment_errors: Vec<FulfillmentError<'tcx>>,
         span: Span,
     ) -> ErrorGuaranteed {
+        // FIXME(fmease): This was copied in parts from an old version of `rustc_hir_typeck::method::suggest`.
+        // Either
+        // * update this code by applying changes similar to #106702 or by taking a
+        //   Vec<(DefId, (DefId, DefId), Option<Vec<FulfillmentError<'tcx>>>)> or
+        // * deduplicate this code across the two crates.
+
         let tcx = self.tcx();
 
         let adt_did = self_ty.ty_adt_def().map(|def| def.did());
@@ -338,7 +344,6 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
 
         let mut bound_spans = Vec::new();
 
-        // FIXME(fmease): Copied from `rustc_hir_typeck::method::probe`. Deduplicate.
         let mut bound_span_label = |self_ty: Ty<'_>, obligation: &str, quiet: &str| {
             let msg = format!(
                 "doesn't satisfy `{}`",
@@ -367,7 +372,6 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
             }
         };
 
-        // FIXME(fmease): Copied from `rustc_hir_typeck::method::probe`. Deduplicate.
         let format_pred = |pred: ty::Predicate<'tcx>| {
             let bound_predicate = pred.kind();
             match bound_predicate.skip_binder() {

Diff for: compiler/rustc_hir_analysis/src/astconv/mod.rs

@@ -2284,8 +2284,9 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
         if let Some((assoc_item, def_scope, impl_substs)) = applicable_candidates.pop() {
             self.check_assoc_ty(assoc_item, name, def_scope, block, span);
 
-            // FIXME(inherent_associated_types): To fully *confirm* the *probed* candidate,
-            // we still need to register region obligations for regionck to prove/disprove.
+            // FIXME(inherent_associated_types): To fully *confirm* the *probed* candidate, we still
+            // need to relate the Self-type with fresh item substs & register region obligations for
+            // regionck to prove/disprove.
 
             let item_substs =
                 self.create_substs_for_associated_item(span, assoc_item, segment, impl_substs);