[Issue 10374] New: Associative arrays work with unoverriden `toHash`/`opEquals`/`opCmp`

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=10374

           Summary: Associative arrays work with unoverriden
                    `toHash`/`opEquals`/`opCmp`
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: druntime
        AssignedTo: nobody at puremagic.com
        ReportedBy: verylonglogin.reg at gmail.com


--- Comment #0 from Denis Shelomovskij <verylonglogin.reg at gmail.com> 2013-06-16 14:01:33 MSD ---
Documentation states classes must override `toHash`/`opEquals`/`opCmp` to work
as associative array keys. But current implementation works anyway.

As people are lazy I suppose lots of such classes are already used as
associative array keys.

So once e.g. compacting GC will be implemented and `Object`'s `toHash` equality
will stop being class instance address equality current AA implementation will
start using `Object`'s `opCmp` which will throw thus breaking lots of code.

I'd suggest to either document such usage or check in AA implementation that
required functions are overriden.

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