Python enumeration with contextual grammar network?

[CatherineWong]

Since Python enumeration was resurrected for Puddleworld - I'm hitting an error now that makes me suspect that python enumeration doesn't work for the ContextualGrammarNetwork, given how primitive indices are stored?

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Traceback (most recent call last):
File "../ec/dreamcoder/enumeration.py", line 230, in _f
r = f(*a, **k)
File "../ec/dreamcoder/enumeration.py", line 366, in solveForTask_python
lowerBound=lowerBound, upperBound=upperBound)
File "../ec/dreamcoder/enumeration.py", line 409, in enumerateForTasks
lowerBound=previousBudget):
File "../ec/dreamcoder/grammar.py", line 1161, in enumeration
maximumDepth=maximumDepth):
File "../ec/dreamcoder/grammar.py", line 1182, in enumeration
maximumDepth=maximumDepth - 1):
File "../ec/dreamcoder/grammar.py", line 1215, in enumerateApplication
maximumDepth=maximumDepth):
File "../ec/dreamcoder/grammar.py", line 1182, in enumeration
maximumDepth=maximumDepth - 1):
File "../ec/dreamcoder/grammar.py", line 1227, in enumerateApplication
argumentIndex=argumentIndex + 1):
File "../ec/dreamcoder/grammar.py", line 1215, in enumerateApplication
maximumDepth=maximumDepth):
File "../ec/dreamcoder/grammar.py", line 1161, in enumeration
maximumDepth=maximumDepth):
File "../ec/dreamcoder/grammar.py", line 1166, in enumeration
else: g = self.library[parent][parentIndex]
TypeError: list indices must be integers or slices, not Primitive

[ellisk42]

Bug should be fixed, but let me know if it doesn't work.