Fix parsing of generic closure formal parameter

tests/language/language.status

Index: tests/language/language.status
diff --git a/tests/language/language.status b/tests/language/language.status
index 6c6ba24fabae5ab29139e0cec1d83d3d30639f62..12b62c41b17e58cba42b3adf36a618d0604e01f3 100644
--- a/tests/language/language.status
+++ b/tests/language/language.status
@@ -46,7 +46,6 @@ async_star_cancel_while_paused_test: RuntimeError
 
 # Experimental feature: Syntactic support for generic methods.
 generic_methods_type_expression_test: RuntimeError # Issue 25869
-generic_methods_generic_function_parameter_test: CompileTimeError # Issue #27299
 
 [ ($compiler == none || $compiler == precompiler || $compiler == dart2app || $compiler == dart2appjit) && $checked ]
 # The generic functions tests fail in checked mode because the parsed type parameters
@@ -56,6 +55,7 @@ generic_methods_test: RuntimeError # Issue 25869
 generic_methods_new_test: RuntimeError # Issue 25869
 generic_local_functions_test: RuntimeError # Issue 25869
 generic_functions_test: RuntimeError # Issue 25869
+generic_methods_generic_function_parameter_test: RuntimeError # Issue 25869
 
 [ ($compiler == none || $compiler == precompiler || $compiler == dart2app || $compiler == dart2appjit) && ($runtime == vm || $runtime == dart_precompiled || $runtime == dart_app) ]