diff --git a/pkg/kernel/lib/class_hierarchy.dart b/pkg/kernel/lib/class_hierarchy.dart
index 24fa14b..1a7de5c 100644
--- a/pkg/kernel/lib/class_hierarchy.dart
+++ b/pkg/kernel/lib/class_hierarchy.dart
@@ -609,7 +609,7 @@
       throw "${class_.fileUri}: No class info for ${class_.name}";
     }
     _ClassInfo superInfo = _infoFor[superclass];
-    if (info == null) {
+    if (superInfo == null) {
       throw "${superclass.fileUri}: No class info for ${superclass.name}";
     }
     if (!info.isSubtypeOf(superInfo)) return null;
@@ -1405,7 +1405,7 @@
   ClassSet(this._classes);
 
   bool contains(Object class_) {
-    return _classes.contains(_classes);
+    return _classes.contains(class_);
   }
 
   ClassSet union(ClassSet other) {
diff --git a/pkg/kernel/runtime/reify/types.dart b/pkg/kernel/runtime/reify/types.dart
index 96ffcd8..f119342 100644
--- a/pkg/kernel/runtime/reify/types.dart
+++ b/pkg/kernel/runtime/reify/types.dart
@@ -633,7 +633,7 @@
       }
     }
 
-    if (!other.hasNamedParameters) true;
+    if (!other.hasNamedParameters) return true;
 
     int j = positionalParameters;
     for (int i = otherPositionalParameters;