@Override
    public <T> T accept(ExpressionVisitor<T> visitor) {
        return visitor.visitExpressionType(this);
    }
Contains a reference to an expression that can be run zero or more
times by a function.

@see <a href="https://jmespath.org/specification.html#data-types">Data types</a>
smithy-jmespath/src/main/java/software/amazon/smithy/jmespath/ast/ExpressionTypeExpression.java