[erlang-bugs] lists:usort bug 1

[Hans Bolinder]

[Peter Lund:]
> Looks like an interface change that has taken place somewhere between 
> R9C-0 and R12B-3.
> Hopefully it is well documented in some release doc... :)

The change is a consequence of a bugfix in R9B (STDLIB 1.11.0):

    lists:sort/2 and lists:merge/3 were not stable. lists:ukeysort/3 and
    lists:usort/2 could leave duplicates. A bug in lists:umerge/3 has been
    fixed. (Own Id: OTP-4204)

Best regards,

Hans Bolinder, Erlang/OTP team, Ericsson