Add a fixme and address a more non trivial case

Co-authored-by: nils <48135649+Nilstrieb@users.noreply.github.com>

Author: est31

compiler/rustc_hir_typeck/src/closure.rs

@@ -398,7 +398,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
     ///
     /// Here:
     /// - E would be `fn(&u32) -> &u32`.
-    /// - S would be `fn(&u32) ->
+    /// - S would be `fn(&u32) -> ?T`
     /// - E' is `&'!0 u32 -> &'!0 u32`
     /// - S' is `&'?0 u32 -> ?T`
     ///

compiler/rustc_trait_selection/src/solve/assembly.rs

@@ -247,7 +247,8 @@ impl<'tcx> EvalCtxt<'_, 'tcx> {
     ///
     /// To deal with this, we first try to normalize the self type and add the candidates for the normalized
     /// self type to the list of candidates in case that succeeds. Note that we can't just eagerly return in
-    /// this case as projections as self types add `
+    /// this case as projections as self types add
+    // FIXME complete the unfinished sentence above
     fn assemble_candidates_after_normalizing_self_ty<G: GoalKind<'tcx>>(
         &mut self,
         goal: Goal<'tcx, G>,