Bring type variables into static scope, but produce compile-time error when they are used.

lib/compiler/implementation/warnings.dart

Index: lib/compiler/implementation/warnings.dart
diff --git a/lib/compiler/implementation/warnings.dart b/lib/compiler/implementation/warnings.dart
index 240fe5874eadd3cc9bebe927428d088d4c658033..a9d02b4d87c2f7c333b955225cb8912a5867ba22 100644
--- a/lib/compiler/implementation/warnings.dart
+++ b/lib/compiler/implementation/warnings.dart
@@ -298,6 +298,9 @@ Length: #{3}''');
       "Patch method parameter '#{3}' doesn't match '#{2}' on origin method "
       "#{1}.");
 
+  static const CANNOT_ACCESS_TYPE_VARIABLE_IN_STATIC_CONTEXT =
+      const MessageKind('cannot access type variable #{1} in static context');
+
   static const COMPILER_CRASHED = const MessageKind(
       "Error: The compiler crashed when compiling this element.");