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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.optional.qual;
import org.checkerframework.framework.qual.InheritedAnnotation;
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;
/**
* Method annotation for methods whose receiver is an {@link java.util.Optional} and return an
* {@code Optional}.
*/
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
@InheritedAnnotation
public @interface OptionalPropagator {}