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scopeguard 0.3.0

A RAII scope guard that will run a given closure when it goes out of scope, even if the code between panics (assuming unwinding panic). Defines the macros `defer!` and `defer_on_unwind!`; the latter only runs if the scope is extited through unwinding on panic.
Documentation 
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#[macro_use(defer)] extern crate scopeguard;

use scopeguard::guard;

fn f() {
    defer!(println!("Called at return or panic"));
    panic!();
}

use std::fs::File;
use std::io::Write;

fn g() {
    let f = File::create("newfile.txt").unwrap();
    let mut file = guard(f, |f| {
        // write file at return or panic
        let _ = f.sync_all();
    });
    // Access the file through the scope guard itself
    file.write(b"test me\n").unwrap();
}

fn main() {
    f();
    g();
}