Type error while looking up map value

[juh9870]

Code to replicate:

a = {}
a.b = {}
a.b.c = {}
(@a.b).c

[nealg42]

The mystery deepens: the map reference returns the appropriate value when the index is in bracket notation.

a.b = {}
a.b.c = {}
(@a.b).c
(@a.b)["c"]

[JoeStrout]

Confirmed that this behavior exists in both C++ and C#. And it only happens with (@a.b).c, not with (a.b).c.

So, this is a legitimate bug, though in an edge-case syntax that I can think of no practical use for. Going to keep it open, but not prioritize it for this next (minor) update.