#3 two file processing / extending failed

[Konstantin Kim]

Macro substitution of many files like "expander.py file1 file2"

;file1 (configuration)
$py(
def test(x)
return x
)
$extend(test)

;file2 (main code)
$(test(1)) ; ok
$test(2) ; not OK !!!

$extend(test)
$test(3) ; after re-extending OK again !!!