সম্পাদনা
use std::error::Error; use std::fmt; #[derive(Debug)] struct UserError { message: String, } impl fmt::Display for UserError { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { write!(f, "{}", self.message) } } impl Error for UserError {} fn user() -> Result<(), UserError> { Err(UserError { message: "ডেটা পাওয়া যায়নি".to_string(), }) } fn page() { if let Err(error) = user() { println!("{}", error); } } fn main() { page(); }
পূর্বরূপ
