Fix interpolation unparse.

tests/language/language.status

 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 # This directory contains tests that are intended to show the
 # current state of the language.
 
 # In order to maintain maximum test coverage for all builds,
 # please use the following procedure to mark a test
 # failed on architectures other than the one you are working on.
@@ skipping 143 matching lines @@
 function_type_alias2_test: Fail
 generic_test: Fail
 generics2_test: Fail
 hello_dart_test: Fail
 implicit_closure1_test: Fail
 implicit_closure_test: Fail, Pass
 issue1363_test: Fail
 list_literal4_test: Fail
 map_literal4_test: Fail
 math_vm_test: Fail
-named_parameters_test: Fail
 static_implicit_closure_test: Fail, Pass
 static_initializer_type_error_test: Fail
 type_cast_vm_test: Fail
 type_checks_in_factory_method_test: Fail
 type_vm_test: Fail
 # Common problems with dart2js.  In illegal family, invalid
 # declarations are simply not parsed.  In pseudo kw dart2js
 # chokes on things like typedef(x) => "typedef $x" and alike.
 abstract_syntax_test/01: Fail
 abstract_syntax_test/02: Fail
@@ skipping 32 matching lines @@
 constructor_duplicate_initializers_test/02: Fail
 fauxverride_test/none: Fail
 gc_test: Fail
 parameter_initializer6_negative_test: Fail
 prefix_core_test: Fail
 private_member3_negative_test: Fail
 super_closure_test: Fail
 super_field_access_test: Fail
 super_first_constructor_test: Fail
 # Should be triaged.
-closure7_test: Fail
 compile_time_constant8_test: Fail
-compile_time_constant_d_test: Fail
-compile_time_constant_e_test: Fail
-compile_time_constant_o_test: Fail
 cond_expr_test: Fail
 condition_bailout_test: Fail
 const_objects_are_immutable_test: Fail
 constructor2_test: Fail
 const_test: Fail
 ct_const_test: Fail
 cyclic_type_variable_test/01: Fail
 cyclic_type_variable_test/02: Fail
 cyclic_type_variable_test/03: Fail
 cyclic_type_variable_test/04: Fail
@@ skipping 16 matching lines @@
 field4_negative_test: Fail
 field5_negative_test: Fail
 field6a_negative_test: Fail
 field7a_negative_test: Fail
 field_optimization2_test: Fail
 field_optimization_test: Fail
 field_override_test/01: Fail
 field_override_test/02: Fail
 field_override_test/none: Fail
 final_syntax_test/none: Fail
-for2_test: Fail
 function_literals_test: Fail
 function_type_alias3_test: Fail
 function_type_alias4_test: Crash, Fail
 function_type_alias5_test/00: Fail
 function_type_alias5_test/01: Fail
 function_type_alias5_test/02: Fail
 function_type_alias6_test: Fail
 function_type_alias7_test/00: Fail
 function_type_alias_test: Fail
 function_type_parameter2_test: Fail
 function_type_parameter_test: Fail
 generic_deep_test: Fail
 generic_instanceof3_test: Fail
 get_set_syntax_test/none: Fail
 getters_setters2_test/03: Fail
 implicit_scope_test: Fail
 implicit_this_test/01: Fail
 implicit_this_test/02: Fail
 implicit_this_test/03: Fail
 implicit_this_test/04: Fail
 implicit_this_test/none: Fail
 implied_interface_test: Fail
 incr_op_test: Fail
 instanceof2_test: Fail
 instanceof3_test: Fail
 instanceof_test: Fail
 interface_factory_constructor_negative_test: Fail
-interface_factory_multi_test: Fail
-interface_factory_test: Fail
 interface_inherit_field_test: Fail
 interface_static_method_negative_test: Fail
 interface_test: Fail
 is_operator_test: Fail
 library5_test: Fail
 library_prefixes_test: Fail
 library_same_name_used_test: Fail
 local_function2_test: Fail
 method_name_test: Fail
 method_override2_test/none: Fail
 method_override_test: Fail
 named_parameters_type_test: Fail
 naming_test: Fail
 non_const_super_negative_test: Fail
 number_identifier_negative_test: Fail
 numbers_test: Fail
 operator1_negative_test: Fail
 operator3_test: Fail
 operator_test: Fail
-optimization_test: Fail
 prefix14_test: Fail
 prefix15_test: Fail
 prefix18_negative_test: Fail
 prefix20_negative_test: Fail
 prefix21_test: Fail
 private3_test: Fail
 private_member1_negative_test: Fail
 private_member_test: Fail
 private_test: Fail
 rethrow_test: Fail
 savannah_test: Fail
 static_final_field_negative_test: Fail
 static_top_level_test/00: Fail
 static_top_level_test/01: Fail
 static_top_level_test/02: Fail
 static_top_level_test/03: Fail
 static_top_level_test/04: Fail
 static_top_level_test/05: Fail
-string_interpolate2_test: Fail
-string_interpolate_test: Fail
 string_interpolation7_test: Fail
-string_interpolation_test/01: Fail
-string_interpolation_test/none: Fail
-super_operator_test: Fail
 super_test: Fail
 switch_label_test: Fail
 syntax_test/none: Fail
 throw1_test: Fail
 throw2_test: Fail
 throw4_test: Fail
 throw5_test: Fail
 top_level_prefixed_declaration_test: Fail
 top_level_var_test: Fail
 try_catch2_test: Fail
@@ skipping 11 matching lines @@
 type_variable_bounds2_test/none: Fail
 type_variable_bounds_test/02: Fail
 type_variable_bounds_test/04: Fail
 type_variable_bounds_test/05: Fail
 type_variable_scope_test/00: Fail
 type_variable_scope_test/01: Fail
 type_variable_scope_test/02: Fail
 type_variable_scope_test/03: Fail
 type_variable_scope_test/04: Fail
 type_variable_scope_test/05: Fail