Fix some issues after introducing NamedType.

testcases/spec-mode/named_parameters.baseline.txt

Index: testcases/spec-mode/named_parameters.baseline.txt
diff --git a/testcases/spec-mode/named_parameters.baseline.txt b/testcases/spec-mode/named_parameters.baseline.txt
index 894bedde8df48e5ba456dbea985ecc6ab8d5ce59..b52bfbe1d414e1788acdf3af890058294005b3ec 100644
--- a/testcases/spec-mode/named_parameters.baseline.txt
+++ b/testcases/spec-mode/named_parameters.baseline.txt
@@ -8,7 +8,10 @@ class Superclass extends core::Object {
     ;
   method foo({dynamic alpha, dynamic beta}) → dynamic {}
   method bar({dynamic alpha, dynamic beta}) → dynamic {}
-  method namedCallback(({alpha: dynamic, beta: dynamic}) → dynamic callback) → dynamic {}
+  method namedCallback(({alpha: core::String, beta: core::int}) → dynamic callback) → dynamic {
+    callback.call(alpha: "one", beta: 2);
+    callback.call(beta: 1, alpha: "two");
+  }
 }
 class Subclass extends self::Superclass {
   constructor •() → void
@@ -16,7 +19,7 @@ class Subclass extends self::Superclass {
     ;
   method foo({dynamic alpha, dynamic beta}) → dynamic {}
   method bar({dynamic alpha, dynamic beta}) → dynamic {}
-  method namedCallback(({alpha: dynamic, beta: dynamic}) → dynamic callback) → dynamic {}
+  method namedCallback(({alpha: core::String, beta: core::int}) → dynamic callback) → dynamic {}
 }
 static method topLevelNamed(dynamic beta, dynamic alpha, {dynamic delta, dynamic gamma}) → dynamic {}
 static method topLevelOptional(dynamic beta, dynamic alpha, [dynamic gamma, dynamic delta]) → dynamic {}