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from pymprog import *



m = begin('a')

assert model._prob_ is m

x = var('x')

end()

assert model._prob_ is None



m = model('b')

# can't use global functions

try: 

    x = var('x')

except: pass

else:

    raise Exception("Can't reach here!")



try: end()

except: pass

else:

    raise Exception("Can't reach here!")