Log_Err

A small extension to the log crate, which provides two methods for core::result::Result<T, E> :

log_except and log_unwrap, which invoke the log::error! macro (in case of Result::Err) in addition to unwrapping/expecting the Result.

Shorthand for:

something().map_err(|e| error!("{}: {:?}", msg, e)).expect(msg)

Example:

let mut file = File::create("foo.txt").log_expect("Error creating file");

# Will output on your logger and on the main program as well:

# Or however your logger formats messages

[ERROR] Error creating file: Os { code: 2, kind: NotFound, message: "No such file or directory" }

# Main program panic'ing with same message

thread 'main' panicked at 'Error creating file: Os { code: 2, kind: NotFound, message: "No such file or directory" }', test.rs:4:48