Forward type arguments in one-shot interceptors.

The status change is unrelated.

[email protected]

Change-Id: Ic611ec7e9fa6b8e5dae9de7fc106fd839dd35bb6
Reviewed-on: https://dart-review.googlesource.com/50322
Reviewed-by: Stephen Adams <[email protected]>
Reviewed-by: Sigmund Cherem <[email protected]>

Author: rakudrama

pkg/compiler/lib/src/js_emitter/interceptor_stub_generator.dart

@@ -392,6 +392,9 @@ class InterceptorStubGenerator {
       for (int i = 0; i < selector.argumentCount; i++) {
         parameterNames.add('a$i');
       }
+      for (int i = 1; i <= selector.typeArgumentCount; i++) {
+        parameterNames.add('\$T$i');
+      }
     }
 
     jsAst.Name invocationName = _namer.invocationName(selector);

tests/language_2/language_2_dart2js.status

@@ -1115,6 +1115,7 @@ compile_time_constant_static5_test/23: CompileTimeError
 conditional_rewrite_test: RuntimeError
 config_import_corelib_test: CompileTimeError
 config_import_test: RuntimeError
+const_cast3_test: Crash # type 'TypeVariableType' is not a subtype of type 'InterfaceType' of 'base' where
 const_dynamic_type_literal_test/02: MissingCompileTimeError
 const_evaluation_test/01: RuntimeError
 const_instance_field_test/01: MissingCompileTimeError