deferresult

README

deferresult

Motivation

Unhandled error in defer statement is always a problem. We have some wrapper utilities in our project to eat errors with Logger looks like this:

func (l *logger) Wrap(f func() error, msg string) func() {
	return func() {
		err := f()
		// log the err down
    }
}

But that caused another trap: defer logger.Wrap(resource.Close, "closing resource") would NOT close the resource since the func() returned by Wrap is not called!

Basically we found that expression in defer should never return anything so this linter is created to check about this.