[Bug 66278] __call metamethod doesn't work on elements of the export table

[bugzilla-daemon]

https://bugzilla.wikimedia.org/show_bug.cgi?id=66278

--- Comment #2 from Jackmcbarn <jackmcbarn+w...@gmail.com> ---
Take this module, for example:
local p = {}

p.continents = {
    na = { area = 24490000, pop = 542056000 },
    sa = { area = 17840000, pop = 392555000 },
    antarctica = { area = 13720000, pop = 4490 }
}

p.oceans = {
    atlantic = { area = 82400000, volume = 323600000 },
    pacific = { area = 165250000, volume = 714000000 }
}

local mt = {}

function mt.__call(t, frame)
    for _,v in ipairs(frame.args) do
        t = t[v]
    end
    return t
end

for _,v in pairs(p) do
    setmetatable(v, mt)
end

return p


This module allows other modules to retrieve data via "foo =
p.continents.na.area", and wikitext to retrieve data via
"{{#invoke:Foo|continents|na|area}}".

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