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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.units.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.SubtypeOf;

/**
 * MixedUnits is the result of multiplying or dividing units, where no more
 * specific unit is known from a UnitsRelations implementation.
 *
 * @checker_framework.manual #units-checker Units Checker
 */
@SubtypeOf(UnknownUnits.class)
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({}) // forbids a programmer from writing it in a program
public @interface MixedUnits {}