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checker-qual contains annotations (type qualifiers) that a programmer writes to specify Java code for type-checking by the Checker Framework.

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package org.checkerframework.checker.signature.qual;

import org.checkerframework.framework.qual.DefaultQualifierInHierarchy;
import org.checkerframework.framework.qual.SubtypeOf;

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

/**
 * Top qualifier in the type hierarchy.
 *
 * This annotation may not be written in source code; it is an implementation detail of the
 * checker.
 *
 * @checker_framework.manual #signature-checker Signature Checker
 */
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({}) // empty target prevents programmers from writing this in a program
@SubtypeOf({})
@DefaultQualifierInHierarchy
public @interface SignatureUnknown {}