D-Programming-Language/d-programming-language.org — pull request #220 by AndrejMitrovic (2012-12-26 20:59:37+00:00)
Title: Make opEquals callable on const/non-const this reference and with const/non-const argument

As asked on SO:

http://stackoverflow.com/questions/14042298/cant-override-opcmp-and-opequals-of-a-struct