Check if the element is a typedef

sdk/lib/_internal/compiler/implementation/resolution/members.dart

Index: sdk/lib/_internal/compiler/implementation/resolution/members.dart
diff --git a/sdk/lib/_internal/compiler/implementation/resolution/members.dart b/sdk/lib/_internal/compiler/implementation/resolution/members.dart
index beb5348e2875c8c23cc21129ef64476cb6a85ef3..001beae644339b3b0386a4472d44c3fc64d001ae 100644
--- a/sdk/lib/_internal/compiler/implementation/resolution/members.dart
+++ b/sdk/lib/_internal/compiler/implementation/resolution/members.dart
@@ -1637,7 +1637,10 @@ class ResolverVisitor extends CommonResolverVisitor<Element> {
       this.statementScope = new StatementScope(),
       typeResolver = new TypeResolver(compiler),
       scope = element.buildScope(),
+      // The type annotations on a typedef do not imply type checks.
+      // TODO(karlklose): clean this up (dartbug.com/8870).
       inCheckContext = compiler.enableTypeAssertions &&
+          !element.isTypedef() &&
           (element.enclosingElement == null ||
            !element.enclosingElement.isTypedef()),
       inCatchBlock = false,