Issue 8059. Disallow mixing in classes that use 'super' from any member.

compiler/java/com/google/dart/compiler/ast/ASTNodes.java

Index: compiler/java/com/google/dart/compiler/ast/ASTNodes.java
diff --git a/compiler/java/com/google/dart/compiler/ast/ASTNodes.java b/compiler/java/com/google/dart/compiler/ast/ASTNodes.java
index 82bc8559b9fcfde6da0cc261ab0b89b8af532c03..88a322f24edf282cca9233d1734ab20c8c351159 100644
--- a/compiler/java/com/google/dart/compiler/ast/ASTNodes.java
+++ b/compiler/java/com/google/dart/compiler/ast/ASTNodes.java
@@ -29,6 +29,7 @@ import com.google.dart.compiler.type.TypeKind;
 
 import java.util.Collections;
 import java.util.List;
+import java.util.concurrent.atomic.AtomicBoolean;
 
 /**
  * Defines utility methods that operate on nodes in a Dart AST structure (instances of
@@ -1429,5 +1430,20 @@ public class ASTNodes {
       return (DartIdentifier) constructor;
     }
   }
+  
+  /**
+   * @return <code>true</code> if given {@link DartNode} has {@link DartSuperExpression}.
+   */
+  public static boolean hasSuperInvocation(DartNode node) {
+    final AtomicBoolean result = new AtomicBoolean();
+    node.accept(new ASTVisitor<Void>() {
+      @Override
+      public Void visitSuperExpression(DartSuperExpression node) {
+        result.set(true);
+        return null;
+      }
+    });
+    return result.get();
+  }
 
 }