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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.checker.nullness;

import org.checkerframework.common.basetype.BaseTypeChecker;

import javax.annotation.processing.SupportedOptions;

/**
 * A type-checker for determining which values are keys for which maps. Typically used as part of
 * the compound checker for the nullness type system.
 *
 * @checker_framework.manual #map-key-checker Map Key Checker
 * @checker_framework.manual #nullness-checker Nullness Checker
 */
@SupportedOptions({"assumeKeyFor"})
public class KeyForSubchecker extends BaseTypeChecker {}