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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.visualize;

/** Types can occurr in different kinds of positions. */
public enum TypeOccurrenceKind {
    /** The type of the tree at its use site. */
    USE_TYPE,
    /**
     * The declared type of the tree. For a method, it should be the method's signature. For a
     * field, it should be the type of the field in its declaration.
     */
    DECLARED_TYPE,
    /** The declared type of the LHS of an assignment or compound assignment tree. */
    ASSIGN_LHS_DECLARED_TYPE,
    /**
     * The type of the RHS of an assignment or compound assignment tree.
     *
     * For a postfix operation, it can be considered as a special assignment tree, in which the
     * LHS is returned and the RHS is the new value of the variable. In this situation, this message
     * kind means the type of the new value of the variable.
     */
    ASSIGN_RHS_TYPE,
}