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package org.checkerframework.common.value.qual;

import java.lang.annotation.ElementType;
import java.lang.annotation.Target;
import org.checkerframework.framework.qual.ImplicitFor;
import org.checkerframework.framework.qual.InvisibleQualifier;
import org.checkerframework.framework.qual.LiteralKind;
import org.checkerframework.framework.qual.SubtypeOf;
import org.checkerframework.framework.qual.TargetLocations;
import org.checkerframework.framework.qual.TypeUseLocation;

/**
 * The bottom type in the Constant Value type system. Programmers should rarely write this type.
 *
 * @checker_framework.manual #constant-value-checker Constant Value Checker
 * @checker_framework.manual #bottom-type the bottom type
 */
@InvisibleQualifier
@ImplicitFor(literals = LiteralKind.NULL, typeNames = java.lang.Void.class)
@SubtypeOf({
    ArrayLen.class,
    BoolVal.class,
    DoubleVal.class,
    IntVal.class,
    StringVal.class,
    ArrayLenRange.class,
    IntRange.class,
    IntRangeFromPositive.class,
    IntRangeFromGTENegativeOne.class,
    IntRangeFromNonNegative.class
})
@Target({ElementType.TYPE_USE, ElementType.TYPE_PARAMETER})
@TargetLocations({TypeUseLocation.EXPLICIT_LOWER_BOUND, TypeUseLocation.EXPLICIT_UPPER_BOUND})
public @interface BottomVal {}