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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.fenum.qual;

import java.lang.annotation.*;

import org.checkerframework.framework.qual.*;

/**
 * A generic fake enumeration qualifier that is parameterized by a name.
 * It is written in source code as, for example,
 * @Fenum("cardSuit") and @Fenum("faceValue"), which
 * would be distinct fake enumerations.
 *
 * @checker_framework.manual #fenum-checker Fake Enum Checker
 */
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE_USE, ElementType.TYPE_PARAMETER})
@SubtypeOf(FenumTop.class)
public @interface Fenum {
    String value();
}