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package org.checkerframework.common.subtyping.qual;

import java.lang.annotation.Target;
import org.checkerframework.framework.qual.InvisibleQualifier;
import org.checkerframework.framework.qual.SubtypeOf;

/**
 * A special annotation intended solely for representing an unqualified type in the qualifier
 * hierarchy, as an argument to {@link SubtypeOf#value()}, in a type qualifier declaration.
 *
 * This annotation may not be written in source code; it is an implementation detail of the
 * checker.
 *
 * 
Note that because of the missing RetentionPolicy, the qualifier will not be stored in
 * bytecode.
 *
 * Only use this qualifier when experimenting with very simple type systems. For any more
 * realistic type systems, introduce a top and bottom qualifier that gets stored in bytecode.
 */
@InvisibleQualifier
@SubtypeOf({})
@Target({}) // empty target prevents programmers from writing this in a program
// At the moment this is done in SubtypingATF to prevent errors in checker-framework-inference
// @DefaultFor(TypeUseLocation.OTHERWISE)
public @interface Unqualified {}