protected final ValidationEvent error(Shape shape, String message) {
        return createEvent(Severity.ERROR, shape, shape.getSourceLocation(), message);
    }
Gets the event ID of the evaluator.

<p>This can be overridden in subclasses to use a different ID.

@return Returns the computed event ID.
smithy-diff/src/main/java/software/amazon/smithy/diff/evaluators/AbstractDiffEvaluator.java