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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.framework.qual;

import java.lang.annotation.Annotation;
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * Declaration annotation applied to type declarations to specify that the annotation on the type
 * declaration should not be applied to unannotated uses of the type. Instead, another default
 * should be applied based on the location of the type or some other defaulting rule.
 *
 * @checker_framework.manual #creating-debugging-options Debugging Options
 */
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.TYPE)
public @interface NoDefaultQualifierForUse {
    /** Top qualifier in hierarchies for which no default annotation for use should be applied. */
    Class[] value() default {};
}