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                                            garfield-xue

Fail to access variable in lazy_constrs_generator callback

I just triggered the same error under CPython with a different input. ``` Starting MIP optimization Option for heuristicsOnOff changed from on to off Option for preprocess changed from sos...

Fail to access variable in lazy_constrs_generator callback

I'm playing with node-weighted steiner tree problems. The code below can trigger the error under pypy3.6-v7.3.0 and CPython3.6.5. Python-MIP version is 1.7.2. ``` from collections import defaultdict import operator import...