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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.framework.util.typeinference.constraint;

import org.checkerframework.framework.type.AnnotatedTypeMirror;
import org.checkerframework.framework.type.AnnotatedTypeMirror.AnnotatedTypeVariable;

/**
 * A constraint of the form: {@code T :> U}
 *
 * @see org.checkerframework.framework.util.typeinference.constraint.TUConstraint
 */
public class TSuperU extends TUConstraint {
    public TSuperU(AnnotatedTypeVariable typeVariable, AnnotatedTypeMirror relatedType) {
        this(typeVariable, relatedType, false);
    }

    /** Create a constraint with a variable greater than a type. */
    public TSuperU(
            AnnotatedTypeVariable typeVariable, AnnotatedTypeMirror relatedType, boolean uIsArg) {
        super(typeVariable, relatedType, uIsArg);
    }

    @Override
    public String toString() {
        return "TSuperU( " + typeVariable + " :> " + relatedType + " )";
    }
}