[Issue 7365] New: AAs broken for Object keys and values with opEquals

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=7365

           Summary: AAs broken for Object keys and values with opEquals
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: critical
          Priority: P2
         Component: druntime
        AssignedTo: nobody at puremagic.com
        ReportedBy: code at klickverbot.at


--- Comment #0 from klickverbot <code at klickverbot.at> 2012-01-24 17:59:56 PST ---
Didn't fully track it down yet, but the following program asserts in getImpl
(mtype.c, line 4371) because AssociativeArray!(Object, TickDuration) can't be
instantiated (DMD 2.058 Git):

---
struct TickDuration {
  bool opEquals(ref const TickDuration rhs) const {
    return true;
  }
}

void main() {
  TickDuration[Object] aa;
  aa.keys;
}
---

Having a look at the gagged errors, it seems like the cause is related to the
opEquals const correctness issue:
---
Error: function object.opEquals (Object lhs, Object rhs) is not callable using
argument types (const(Object),const(Object))
Error: cannot implicitly convert expression (this.key) of type const(Object) to
object.Object
Error: cannot implicitly convert expression (p.key) of type const(Object) to
object.Object
---

The error is encountered while generating the default opEquals for the Slot
type added in
https://github.com/D-Programming-Language/druntime/commit/cd7b477b83cc8a75a90258bd2ab63fa8c92ba10b.

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