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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.mustcall.qual;

import org.checkerframework.framework.qual.SubtypeOf;

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

/**
 * The top qualifier in the Must Call type hierarchy. It represents a type that might have an
 * obligation to call any set (even an infinite set!) of methods. This type contains every object.
 * This type should rarely be written by a programmer.
 *
 * The Object Construction Checker cannot verify that the property represented by this annotation
 * is enforced; that is, the Object Construction Checker will always issue a warning when the value
 * of an expression with this type might be de-allocated.
 *
 * @checker_framework.manual #must-call-checker Must Call Checker
 */
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE_USE, ElementType.TYPE_PARAMETER})
@SubtypeOf({})
public @interface MustCallUnknown {}