Ignore member refs and lambdas

Author: tkindy

core/src/main/java/com/google/errorprone/bugpatterns/ClassInitializationDeadlock.java

@@ -38,6 +38,8 @@
 import com.sun.source.tree.ClassTree;
 import com.sun.source.tree.ExpressionTree;
 import com.sun.source.tree.IdentifierTree;
+import com.sun.source.tree.LambdaExpressionTree;
+import com.sun.source.tree.MemberReferenceTree;
 import com.sun.source.tree.MemberSelectTree;
 import com.sun.source.tree.MethodTree;
 import com.sun.source.tree.Tree;
@@ -112,6 +114,16 @@ public Void visitMethod(MethodTree node, Void unused) {
         return null;
       }
 
+      @Override
+      public Void visitMemberReference(MemberReferenceTree node, Void unused) {
+        return null;
+      }
+
+      @Override
+      public Void visitLambdaExpression(LambdaExpressionTree node, Void unused) {
+        return null;
+      }
+
       @Override
       public Void visitMemberSelect(MemberSelectTree tree, Void unused) {
         if (ASTHelpers.constValue(tree) != null) {