src/jdk.compiler/share/classes/com/sun/tools/javac/jvm/StringConcat.java

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  import com.sun.tools.javac.util.*;
  
  import static com.sun.tools.javac.code.Kinds.Kind.MTH;
  import static com.sun.tools.javac.code.TypeTag.*;
  import static com.sun.tools.javac.jvm.ByteCodes.*;
+ import static com.sun.tools.javac.tree.JCTree.Tag.LITERAL;
  import static com.sun.tools.javac.tree.JCTree.Tag.PLUS;
  import com.sun.tools.javac.jvm.Items.*;
  
  import java.util.HashMap;
  import java.util.Map;