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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.builder;

import java.util.Set;
import javax.lang.model.type.TypeMirror;

/** A TryFrame maps a thrown exception type to a set of possible control-flow successors. */
interface TryFrame {
  /**
   * Given a type of thrown exception, add the set of possible control flow successor {@link Label}s
   * to the argument set. Return true if the exception is known to be caught by one of those labels
   * and false if it may propagate still further.
   */
  public boolean possibleLabels(TypeMirror thrown, Set labels);
}