Function pre_eval_with_calling_handlers 

fn pre_eval_with_calling_handlers(
    args: &[Arg],
    env: &Environment,
    context: &BuiltinContext<'_>,
) -> Result<RValue, RError>

Evaluate an expression with calling handlers for conditions.

Unlike tryCatch, handlers run without unwinding the call stack, allowing the signaling code to resume execution after the handler returns.

@param expr the expression to evaluate @param … named handlers: class = handler_function @return the result of expr