Differentiate between unresolved class and constructor.

pkg/compiler/lib/src/resolution/access_semantics.dart

Index: pkg/compiler/lib/src/resolution/access_semantics.dart
diff --git a/pkg/compiler/lib/src/resolution/access_semantics.dart b/pkg/compiler/lib/src/resolution/access_semantics.dart
index ecd16c0f8d938033c3db285adce90d73c0051609..c445c58c0ac1a533d872b24fbc1cf678abf0fa75 100644
--- a/pkg/compiler/lib/src/resolution/access_semantics.dart
+++ b/pkg/compiler/lib/src/resolution/access_semantics.dart
@@ -388,17 +388,32 @@ enum ConstructorAccessKind {
   ///
   ABSTRACT,
 
-  /// An invocation of an unresolved constructor or an unresolved type.
+  /// An invocation of a constructor on an unresolved type.
+  ///
+  /// For instance
+  ///     m() => new Unresolved();
+  ///
+  UNRESOLVED_TYPE,
+
+  /// An invocation of an unresolved constructor.
+  ///
+  /// For instance
+  ///     class C {
+  ///       C();
+  ///     }
+  ///     m() => new C.unresolved();
+  ///
+  UNRESOLVED_CONSTRUCTOR,
+
+  /// An const invocation of an non-constant constructor.
   ///
   /// For instance
   ///     class C {
   ///       C();
   ///     }
-  ///     m1() => new C.unresolved();
-  ///     m2() => new Unresolved();
+  ///     m() => const C();
   ///
-  // TODO(johnniwinther): Differentiate between error types.
-  ERRONEOUS,
+  NON_CONSTANT_CONSTRUCTOR,
 
   /// An invocation of an ill-defined redirecting factory constructor.
   ///
@@ -431,7 +446,9 @@ class ConstructorAccessSemantics {
   /// `true` if this invocation is erroneous.
   bool get isErroneous {
     return kind == ConstructorAccessKind.ABSTRACT ||
-           kind == ConstructorAccessKind.ERRONEOUS ||
+           kind == ConstructorAccessKind.UNRESOLVED_TYPE ||
+           kind == ConstructorAccessKind.UNRESOLVED_CONSTRUCTOR ||
+           kind == ConstructorAccessKind.NON_CONSTANT_CONSTRUCTOR ||
            kind == ConstructorAccessKind.ERRONEOUS_REDIRECTING_FACTORY;
   }
 }