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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.qualframework.util;

import java.util.List;
import javax.lang.model.element.Element;

/** {@link ExtendedTypeMirror} variant for {@link javax.lang.model.type.DeclaredType}. */
public interface ExtendedDeclaredType extends ExtendedReferenceType {
    /** Returns the element corresponding to this type. */
    Element asElement();
    /** Returns the type of the innermost enclosing instance, or a {@link
     * ExtendedNoType} of kind NONE if there is no enclosing
     * instance.  Only types corresponding to inner classes have an enclosing
     * instance. */
    ExtendedTypeMirror getEnclosingType();
    /**
     * Returns the actual type arguments of this type. For a type nested within
     * a parameterized type (such as
     * Outer<String>.Inner<Number>), only the type
     * arguments of the innermost type are included.
     */
    List getTypeArguments();
}