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Checker Qual is the set of annotations (qualifiers) and supporting classes used by the Checker Framework to type check Java source code. Please see artifact: org.checkerframework:checker

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package org.checkerframework.qualframework.base;

/**
 * {@link DefaultQualifiedTypeFactory} component for performing subtyping
 * checks between {@link QualifiedTypeMirror}s.
 */
public interface TypeHierarchy {
    /** Checks if subtype is a subtype of supertype. */
    boolean isSubtype(QualifiedTypeMirror subtype, QualifiedTypeMirror supertype);
}