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> On Wed, Dec 12, 2012 at 4:17 PM, Roberto Ierusalimschy
> <roberto@inf.puc-rio.br> wrote:
> > ;(g or h)()   -- always valid in 5.2, not in 5.1
> 
> ... except as the first statement of a block in Lua 5.1.

Also after a line ending with semicolon:

  a = 1;
  ;(g or h)()  -- valid in 5.2, not in 5.1

-- Roberto