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

            Bug ID: 66278
           Summary: __call metamethod doesn't work on elements of the
                    export table
           Product: MediaWiki extensions
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: trivial
          Priority: Unprioritized
         Component: Scribunto
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected], [email protected],
                    [email protected]
       Web browser: ---
   Mobile Platform: ---

Create the following as Module:Foo:
local p, mt = {}, {}

function mt.__call(t, frame)
    return 'Hello from the __call metamethod'
end

p.main = setmetatable({}, mt)

return p

From the sandbox, =p.main(mw.getCurrentFrame()) correctly displays "Hello from
the __call metamethod". From wikitext, however, {{#invoke:Foo|main}} displays a
script error that p.main isn't a function.

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