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> I didn't saw xpcall mentioned in Roberto's list of changes.

That is still in trial... "xpcall" would be the pcall with an error
handler (as its first argument). I am not sure it will go into the final
version anyway...

> Nor popen.

That took the functionality of readfrom/writeto("| ..."):

  f = io.popen("ls", "r")

Now the function is always there, but raises an error if you compile
Lua without -DPOPEN.

-- Roberto