package org.checkerframework.checker.units.qual;
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
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.ImplicitFor;
import org.checkerframework.framework.qual.SubtypeOf;
import org.checkerframework.framework.qual.TargetLocations;
import org.checkerframework.framework.qual.TypeUseLocation;
/**
* The bottom type in the Units type system. Programmers should rarely write this type.
*
* @checker_framework.manual #units-checker Units Checker
* @checker_framework.manual #bottom-type the bottom type
*/
@SubtypeOf({}) // needs to be done programmatically
@Documented
@Retention(RetentionPolicy.RUNTIME)
@DefaultFor(TypeUseLocation.LOWER_BOUND)
@ImplicitFor(typeNames = Void.class)
@Target({ElementType.TYPE_USE, ElementType.TYPE_PARAMETER})
@TargetLocations({TypeUseLocation.EXPLICIT_LOWER_BOUND, TypeUseLocation.EXPLICIT_UPPER_BOUND})
public @interface UnitsBottom {}