Use fewer delayed bugs.

For some cases where it's clear that an error has already occurred,
e.g.:
- there's a comment stating exactly that, or
- things like HIR lowering, where we are lowering an error kind

The commit also tweaks some comments around delayed bug sites.

compiler/rustc_infer/src/infer/lexical_region_resolve/mod.rs

@@ -802,14 +802,12 @@ impl<'cx, 'tcx> LexicalResolver<'cx, 'tcx> {
         }
 
         // Errors in earlier passes can yield error variables without
-        // resolution errors here; delay ICE in favor of those errors.
-        self.tcx().dcx().span_delayed_bug(
-            self.var_infos[node_idx].origin.span(),
-            format!(
-                "collect_error_for_expanding_node() could not find \
-                 error for var {node_idx:?} in universe {node_universe:?}, lower_bounds={lower_bounds:#?}, \
-                 upper_bounds={upper_bounds:#?}"
-            ),
+        // resolution errors here; ICE if no errors have been emitted yet.
+        assert!(
+            self.tcx().dcx().has_errors().is_some(),
+            "collect_error_for_expanding_node() could not find error for var {node_idx:?} in \
+            universe {node_universe:?}, lower_bounds={lower_bounds:#?}, \
+            upper_bounds={upper_bounds:#?}",
         );
     }
 

compiler/rustc_infer/src/infer/outlives/obligations.rs

@@ -300,9 +300,9 @@ where
                     self.components_must_outlive(origin, subcomponents, region, category);
                 }
                 Component::UnresolvedInferenceVariable(v) => {
-                    // ignore this, we presume it will yield an error
-                    // later, since if a type variable is not resolved by
-                    // this point it never will be
+                    // Ignore this, we presume it will yield an error later,
+                    // since if a type variable is not resolved by this point
+                    // it never will be.
                     self.tcx.dcx().span_delayed_bug(
                         origin.span(),
                         format!("unresolved inference variable in outlives: {v:?}"),

compiler/rustc_infer/src/infer/outlives/verify.rs

@@ -172,13 +172,13 @@ impl<'cx, 'tcx> VerifyBoundCx<'cx, 'tcx> {
                 self.bound_from_components(components, visited)
             }
             Component::UnresolvedInferenceVariable(v) => {
-                // ignore this, we presume it will yield an error
-                // later, since if a type variable is not resolved by
-                // this point it never will be
+                // Ignore this, we presume it will yield an error later, since
+                // if a type variable is not resolved by this point it never
+                // will be.
                 self.tcx
                     .dcx()
                     .delayed_bug(format!("unresolved inference variable in outlives: {v:?}"));
-                // add a bound that never holds
+                // Add a bound that never holds.
                 VerifyBound::AnyBound(vec![])
             }
         }