Package errors provides errors that have stack-traces. This is particularly useful when you want to understand the state of execution when an error was returned unexpectedly. It provides the type *Error which implements the standard golang error interface, so you can use this library interchangably with code that is expecting a normal error return. For example: This can be called as follows: This package was original written to allow reporting to Bugsnag, but after I found similar packages by Facebook and Dropbox, it was moved to one canonical location so everyone can benefit.