Allow access to type variables as expressions in factory constructors.

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

Index: pkg/compiler/lib/src/resolution/members.dart
diff --git a/pkg/compiler/lib/src/resolution/members.dart b/pkg/compiler/lib/src/resolution/members.dart
index 91c47871288a2a267d088d53784b8d83d88882a4..1630f52f0e75a20a317a189bfba2bf8566ba89d4 100644
--- a/pkg/compiler/lib/src/resolution/members.dart
+++ b/pkg/compiler/lib/src/resolution/members.dart
@@ -1960,8 +1960,7 @@ class TypeResolver {
             outer != null && outer.isFactoryConstructor;
         if (!outer.isClass &&
             !outer.isTypedef &&
-            !isInFactoryConstructor &&
-            Elements.isInStaticContext(visitor.enclosingElement)) {
+            !Elements.hasAccessToTypeVariables(visitor.enclosingElement)) {
           registry.registerThrowRuntimeError();
           type = reportFailureAndCreateType(
               MessageKind.TYPE_VARIABLE_WITHIN_STATIC_MEMBER,
@@ -2841,7 +2840,7 @@ class ResolverVisitor extends MappingVisitor<ResolutionResult> {
       } else if (target.isTypeVariable) {
         ClassElement cls = target.enclosingClass;
         assert(enclosingElement.enclosingClass == cls);
-        if (Elements.isInStaticContext(enclosingElement)) {
+        if (!Elements.hasAccessToTypeVariables(enclosingElement)) {
           compiler.reportError(node,
               MessageKind.TYPE_VARIABLE_WITHIN_STATIC_MEMBER,
               {'typeVariableName': node.selector});