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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 BinaryName binary name} as defined in the Java
 * Language Specification, section 13.1, but only for a non-array type.
 *
 * Example: package.package2.Class$Inner
 * Example: Class
 *
 * @checker_framework.manual #signature-checker Signature Checker
 */
@SubtypeOf({BinaryName.class, ClassGetName.class})
@ImplicitFor(stringPatterns="^[A-Za-z_][A-Za-z_0-9]*(\\.[A-Za-z_][A-Za-z_0-9]*)*(\\$[A-Za-z_0-9]+)*$")
@Target({ElementType.TYPE_USE, ElementType.TYPE_PARAMETER})
public @interface BinaryNameForNonArray {}