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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 org.checkerframework.checker.nullness.qual.Nullable;
import org.checkerframework.dataflow.cfg.node.Node;
import org.checkerframework.dataflow.qual.Pure;

/** A regular basic block that contains a sequence of {@link Node}s. */
public interface RegularBlock extends SingleSuccessorBlock {
    /**
     * Returns the regular successor block.
     *
     * @return the regular successor block
     */
    @Pure
    @Nullable Block getRegularSuccessor();

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