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lua_getinfo - name field

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According to the documentation, the "name" field returned by lua_getinfo
is either a reasonable name for the call, or NULL. When the call is a
tail call, however, it is set to "" (like "namewhat"'s semantics), which
is neither.
I'd recommend that info_tailcall set ar->name to NULL, not "".
-- 
Glenn Maynard

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