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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.i18n.qual;

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

/**
 * Indicates that the {@code String} type has been localized and
 * formatted for the target output locale.
 *
 * @checker_framework.manual #i18n-checker Internationalization Checker
 */
@SubtypeOf(UnknownLocalized.class)
@ImplicitFor(literals = {
        /* All integer literals */
        LiteralKind.INT,
        LiteralKind.LONG,
        LiteralKind.FLOAT,
        LiteralKind.DOUBLE,
        LiteralKind.BOOLEAN,

        /* null should be the bottom type */
        LiteralKind.NULL

        // CHAR_LITERAL,
        // STRING_LITERAL,
    }
)
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE_USE, ElementType.TYPE_PARAMETER})
public @interface Localized {}