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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.qualframework.qual;

import org.checkerframework.framework.qual.SubtypeOf;

/**
 * Annotation used internally by the qualifier framework for mapping annotations to qualifiers.
 */
@SubtypeOf({})
public @interface QualifierKey {
    /**
     * An index into the lookup table.
     */
    int index() default -1;

    /**
     * A string representation of the qualifier this {@link QualifierKey} represents.  This lets us have
     * slightly nicer error messages.
     */
    String desc() default "";
}