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i    := 1
s%i% := "test"
s    := s%i%
msgbox % f(s,s)       ; "test test"
msgbox % f(s%i%,s%i%) ; "test" <- should be "test test"
msgbox % f(s%i)       ; "test ok"
msgbox % f(s%i,s%i)   ; The following variable name contains
                      ; an illegal character: "s11à"

f(s1,s2="ok")
{
  return s1 . " " . s2
}