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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.regex.qual;

import org.checkerframework.qualframework.poly.SimpleQualifierParameterAnnotationConverter;
import org.checkerframework.qualframework.poly.qual.Wildcard;

import java.lang.annotation.ElementType;
import java.lang.annotation.Repeatable;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * Var is a qualifier parameter use.
 *
 * @see org.checkerframework.checker.tainting.qual.Var
 */
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE_USE, ElementType.TYPE_PARAMETER})
@Repeatable(MultiVar.class)
public @interface Var {
    /**
     * Which parameter this @Var is a use of.
     */
    String arg()  default SimpleQualifierParameterAnnotationConverter.PRIMARY_TARGET;

    /**
     * The name of the parameter to set.
     */
    String param() default SimpleQualifierParameterAnnotationConverter.PRIMARY_TARGET;

    /**
     * Specify that this use is a wildcard with a bound.
     */
    Wildcard wildcard() default Wildcard.NONE;
}