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

/**
 * An annotation intended solely for representing an unqualified type in the qualifier hierarchy for
 * the Purity Checker.
 *
 * @checker_framework.manual #purity-checker Purity Checker
 */
@Documented
@Retention(RetentionPolicy.SOURCE) // do not store in .class file
@Target({ElementType.TYPE_USE, ElementType.TYPE_PARAMETER})
@SubtypeOf({})
@DefaultQualifierInHierarchy
@InvisibleQualifier
public @interface PurityUnqualified {}