try_blocks - The Rust Unstable Book

# `try_blocks`

The tracking issue for this feature is: #31436

The `try_blocks` feature adds support for `try` blocks. A `try` block creates a new scope one can use the `?` operator in.

    #![allow(unused_variables)]
    #![feature(try_blocks)]

    fn main() {
    use std::num::ParseIntError;

    let result: Result<i32, ParseIntError> = try {
        "1".parse::<i32>()?
            + "2".parse::<i32>()?
            + "3".parse::<i32>()?
    };
    assert_eq!(result, Ok(6));

    let result: Result<i32, ParseIntError> = try {
        "1".parse::<i32>()?
            + "foo".parse::<i32>()?
            + "3".parse::<i32>()?
    };
    assert!(result.is_err());
    }