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The Checker Framework enhances Java's type system to make it more powerful and useful. This lets software developers detect and prevent errors in their Java programs. The Checker Framework includes compiler plug-ins ("checkers") that find bugs or verify their absence. It also permits you to write your own compiler plug-ins.

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package org.checkerframework.dataflow.cfg.node;

import com.sun.source.tree.Tree;
import javax.lang.model.type.TypeMirror;
import org.checkerframework.checker.nullness.qual.Nullable;

/** A node to model the implicit {@code this}, e.g., in a field access. */
public class ImplicitThisNode extends ThisNode {

  public ImplicitThisNode(TypeMirror type) {
    super(type);
  }

  @Override
  public @Nullable Tree getTree() {
    return null;
  }

  @Override
  public  R accept(NodeVisitor visitor, P p) {
    return visitor.visitImplicitThis(this, p);
  }

  @Override
  public String toString() {
    return "(" + getName() + ")";
  }
}