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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.signature.qual;

import org.checkerframework.framework.qual.SubtypeOf;

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;

/**
 * The syntax for binary names that appears in a class file, as defined in the JVM
 * Specification, section 4.2. A {@linkplain BinaryName binary name} is conceptually the name
 * for the class or interface in a compiled binary, but the actual representation of that name in
 * its class file is slightly different.
 *
 * Internal form is the same as the binary name, but with periods ({@code .}) replaced by forward
 * slashes ({@code /}).
 *
 * Programmers more often use the binary name, leaving the internal form as a JVM implementation
 * detail.
 *
 * @see BinaryName
 * @checker_framework.manual #signature-checker Signature Checker
 */
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE_USE, ElementType.TYPE_PARAMETER})
@SubtypeOf(SignatureUnknown.class)
public @interface InternalForm {}