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The Checker Framework enhances Java’s type system to make it more powerful and useful. This lets software developers detect and prevent errors in their Java programs. The Checker Framework includes compiler plug-ins ("checkers") that find bugs or verify their absence. It also permits you to write your own compiler plug-ins.

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package org.checkerframework.checker.signature.qual;

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

import org.checkerframework.framework.qual.ImplicitFor;
import org.checkerframework.framework.qual.SubtypeOf;

/**
 * Represents a {@link FieldDescriptor field descriptor} (JVM type format)
 * as defined in the Java
 * Virtual Machine Specification, section 4.3.2, but not for all
 * array types:  only for an array type whose base type is either a
 * primitive or in the unnamed package.  Also non-array primitives.
 *
 * @checker_framework.manual #signature-checker Signature Checker
 */
@SubtypeOf({ClassGetName.class, FieldDescriptor.class})
@ImplicitFor(stringPatterns="^([BCDFIJSZ]|\\[+[BCDFIJSZ]|\\[L[A-Za-z_][A-Za-z_0-9]*;)$")
@Target({ElementType.TYPE_USE, ElementType.TYPE_PARAMETER})
public @interface FieldDescriptorForArray {}