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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.common.value.qual;

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 value of the annotated expression is a sequence containing at least the given number of
 * elements. An alias for an {@link ArrayLenRange} annotation with a {@code from} field and the
 * maximum possible value for an array length ({@code Integer.MAX_VALUE}) as its {@code to} field.
 *
 * This annotation is used extensively by the Index Checker.
 *
 * @checker_framework.manual #constant-value-checker Constant Value Checker
 */
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE_USE, ElementType.TYPE_PARAMETER})
public @interface MinLen {
  /** The minimum number of elements in this sequence. */
  int value() default 0;
}