[Issue 20812] _d_assocarrayliteralTX segfault assigning a shared associative array an AA literal

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20812

mail at ernestocastellotti.it changed:

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--- Comment #2 from mail at ernestocastellotti.it ---
I investigate this bug and the problem is that ti.key (field of
TypeInfo_AssociativeArray) is null.

The sigsegv obviously occurs at this line
https://github.com/dlang/dmd/blob/342a226833a0e9c7a90bbb64ae8dc35aa6d6bfdc/druntime/src/rt/aaA.d#L766

I'm trying to figure out what the reason for this would be and how to fix it.

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