The lack of context is a pain. For instance, trying to open a file that doesn't exist just gives the error "file not found" without telling you the path you tried to open.
Fair enough. But that doesn't have to do with the error handling mechanism of Rust, nor would any of these error helper libraries fix that. It's just a criticism of the error type that's actually returned. A Java-style exception can be written that's just as lacking. No language that I'm aware of will automatically include function arguments in its errors/exceptions- it's up to the author of the error/exception type to include that info.
