Function eval_v2_expr 

pub fn eval_v2_expr<'a>(
    expr: &V2Expr,
    record: &'a Value,
    context: Option<&'a Value>,
    out: &'a Value,
    path: &str,
    ctx: &V2EvalContext<'a>,
) -> Result<EvalValue, TransformError>

Evaluate a v2 expression