AddErrorCode takes an error and returns an instance satisfying the Error interface.

Extract the tag annotations from a struct into a string array.

NewError constructs an error with a code.

NewErrorContext constructs an error context with list of valid codes.

SortErrors sorts the list of errors lexically.

when a default message already exists.

when a bad error code is given in creation of new error.

when the fmt string isn't a string.

when the error context is modifed after having created an error.

when creating an error with no error message, default message wasn't found.

ErrorContext regulates which error codes can be made and keeps a count of all the errors created through the context.

Error describes an interface that supports error codes.