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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.interning.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;

import org.checkerframework.framework.qual.PolymorphicQualifier;

/**
 * A polymorphic qualifier for the Interning type system.
 *
 * 
 * Any method written using @PolyInterned conceptually has two versions:  one
 * in which every instance of @PolyInterned has been replaced by @Interned, and
 * one in which every instance of @PolyInterned has been erased.
 *
 * @checker_framework.manual #interning-checker Interning Checker
 */
@PolymorphicQualifier(UnknownInterned.class)
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE_USE, ElementType.TYPE_PARAMETER})
public @interface PolyInterned {}