Macro as_expr_or_opt_err 

macro_rules! as_expr_or_opt_err {
    ($opt:expr, $error_msg:expr) => { ... };
}

Macro to unwrap an Option to Expr for functions returning Option. Returns the expression on success, or returns Some(Err(anyhow::Error)) on failure.

This macro is designed for use in functions that return Option<Result<T, anyhow::Error>>.

Usage

let expr = as_expr_or_opt_err!(result_value, "Argument not expression");

Arguments

• $opt: The EvaluateResultValue to unwrap
• $error_msg: Error message string literal