@Override
        public Response apply(Context context, Shape shape) {
            if (shape.equals(shapeToMatch)) {
                matched = true;
                return Response.STOP;
            }

            return Response.CONTINUE;
        }
Checks if the given value is in the result of a selector.
smithy-model/src/main/java/software/amazon/smithy/model/selector/InSelector.java