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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.fenum.qual;

import java.lang.annotation.Documented;
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.TypeUseLocation;
import org.checkerframework.framework.qual.DefaultQualifierInHierarchy;
import org.checkerframework.framework.qual.SubtypeOf;

/**
 * An unqualified type.  Such a type is incomparable to (that is, neither a
 * subtype nor a supertype of) any fake enum type.
 * 
 *
 * This annotation may not be written in source code; it is an
 * implementation detail of the checker.
 *
 * @checker_framework.manual #fenum-checker Fake Enum Checker
 */
@SubtypeOf( { FenumTop.class } )
@DefaultQualifierInHierarchy
@DefaultFor({ TypeUseLocation.IMPLICIT_UPPER_BOUND, TypeUseLocation.IMPLICIT_LOWER_BOUND,
              TypeUseLocation.EXCEPTION_PARAMETER })
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({}) // empty target prevents programmers from writing this in a program
public @interface FenumUnqualified {}