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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;

/**
 * Represents a basic block in a control flow graph.
 *
 * @author Stefan Heule
 *
 */
public interface Block {

    /** The types of basic blocks */
    public static enum BlockType {

        /** A regular basic block. */
        REGULAR_BLOCK,

        /** A conditional basic block. */
        CONDITIONAL_BLOCK,

        /** A special basic block. */
        SPECIAL_BLOCK,

        /** A basic block that can throw an exception. */
        EXCEPTION_BLOCK,
    }

    /**
     * @return the type of this basic block
     */
    BlockType getType();

    /**
     * @return the unique identifier of this block
     */
    long getId();

}