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package org.checkerframework.common.aliasing.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.DefaultFor;
import org.checkerframework.framework.qual.DefaultQualifierInHierarchy;
import org.checkerframework.framework.qual.SubtypeOf;
import org.checkerframework.framework.qual.TypeUseLocation;

/**
 * An expression with this type might have an alias. In other words, some other expression,
 * evaluated at the same program point, might evaluate to the exact same object value.
 *
 * @see Unique
 * @checker_framework.manual #aliasing-checker Aliasing Checker
 */
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE_PARAMETER, ElementType.TYPE_USE})
@SubtypeOf({})
@DefaultQualifierInHierarchy
@DefaultFor(
        value = {TypeUseLocation.UPPER_BOUND, TypeUseLocation.LOWER_BOUND},
        types = Void.class)
public @interface MaybeAliased {}