Fix analyzer's treatment of mixin constructors.

pkg/analyzer/lib/src/generated/resolver.dart

Index: pkg/analyzer/lib/src/generated/resolver.dart
diff --git a/pkg/analyzer/lib/src/generated/resolver.dart b/pkg/analyzer/lib/src/generated/resolver.dart
index 7d9268530f8484c113dcf2bceee102c32378f5df..b4a3d987219dfe364f11fc6439bd6739b163b0ab 100644
--- a/pkg/analyzer/lib/src/generated/resolver.dart
+++ b/pkg/analyzer/lib/src/generated/resolver.dart
@@ -5756,10 +5756,15 @@ class ImplicitConstructorBuilder extends ScopedVisitor {
           List<ConstructorElement> implicitConstructors = new List<ConstructorElement>();
           for (int i = 0; i < count; i++) {
             ConstructorElement explicitConstructor = constructors[i];
-            if (!explicitConstructor.isFactory) {
+            if (!explicitConstructor.isFactory &&
+                classElement.isSuperConstructorAccessible(explicitConstructor)) {
               implicitConstructors.add(_createImplicitContructor(classType, explicitConstructor, parameterTypes, argumentTypes));
             }
           }
+          if (implicitConstructors.isEmpty) {
+            reportErrorForNode(CompileTimeErrorCode.MIXIN_HAS_NO_CONSTRUCTORS,
+                node, [superclassElement.name]);
+          }
           classElement.constructors = implicitConstructors;
         }
       }