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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.block;

import java.util.List;

import org.checkerframework.dataflow.cfg.node.Node;

/**
 * A regular basic block that contains a sequence of {@link Node}s.
 *
 * 
 *
 * The following invariant holds.
 *
 * 
 * forall n in getContents() :: n.getBlock() == this
 * 
 *
 * @author Stefan Heule
 *
 */
public interface RegularBlock extends SingleSuccessorBlock {

    /**
     * @return the unmodifiable sequence of {@link Node}s.
     */
    List getContents();

    /**
     * @return the regular successor block
     */
    Block getRegularSuccessor();

    /**
     * Is this block empty (i.e., does it not contain any contents).
     */
    boolean isEmpty();

}