Issue 932. Checks for various named arguments cases.

compiler/java/com/google/dart/compiler/resolver/TopLevelElementBuilder.java

Index: compiler/java/com/google/dart/compiler/resolver/TopLevelElementBuilder.java
diff --git a/compiler/java/com/google/dart/compiler/resolver/TopLevelElementBuilder.java b/compiler/java/com/google/dart/compiler/resolver/TopLevelElementBuilder.java
index 122c74dea7ba53e6aea45edf743fbad9dbdf3e3b..2d2e11c9de1f780cc17e26478536fdbf3a265119 100644
--- a/compiler/java/com/google/dart/compiler/resolver/TopLevelElementBuilder.java
+++ b/compiler/java/com/google/dart/compiler/resolver/TopLevelElementBuilder.java
@@ -23,8 +23,11 @@ import com.google.dart.compiler.ast.DartUnit;
 import com.google.dart.compiler.ast.LibraryUnit;
 import com.google.dart.compiler.ast.Modifiers;
 import com.google.dart.compiler.common.SourceInfo;
+import com.google.dart.compiler.type.Type;
+import com.google.dart.compiler.type.TypeVariable;
 import com.google.dart.compiler.type.Types;
 
+import java.util.Collections;
 import java.util.List;
 
 /**
@@ -151,8 +154,10 @@ public class TopLevelElementBuilder {
     public Void visitClass(DartClass node) {
       ClassElement element = Elements.classFromNode(node, library);
       List<DartTypeParameter> parameterNodes = node.getTypeParameters();
-      element.setType(Types.interfaceType(element,
-                                          Elements.makeTypeVariables(parameterNodes, element)));
+      List<TypeVariable> typeVariables = Elements.makeTypeVariables(parameterNodes, element);
+      element.setType(Types.interfaceType(
+          element,
+          Collections.<Type>unmodifiableList(typeVariables)));

[zundel, 2012/01/23 16:18:21]

Is the unmodifiable list just for safety or did you find a problem this way? 
Maybe Elements.makeTypeVariables should return an immutable list? 

[scheglov, 2012/01/23 19:32:27]

Basically this allows us to pass List<TypeVariable>, i.e. List<? extends Type>,
into method which accepts List<Type>, because we can guarantee that no one will
add other subclass of Type, incompatible with TypeVariable.

       node.setSymbol(element);
       return null;
     }