[lisivka]

Where you found this expect() function and how it will receive error, generated by baz? I read Rust documentation about error handling multiple times, but newer saw adequate error handling.

The best solution I know is error-chain library:

    use errors::ChainErr;
    try!(do_something().chain_err(|| "Something went wrong"));

[steveklabnik]

https://doc.rust-lang.org/stable/std/result/enum.Result.html...

[lisivka]

Panic will stop program at place of error, while I want nicely stacked error message list:

    [reports.rs:25] ERROR: Cannot write report "Foo" to file "foo.xml".
    [templates.rs:125] ERROR: Cannot process template "header". Check is template file exists and readable.
    [fileio.rs:45] ERROR: Cannot open file "/usr/share/foo/templates/header.tmpl": unable to enter directory "/usr/share/foo". Check directory permissions.

Instead of

   writing report cannot open file done

It saves lot of time(money) in production.