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One adhoc solution for this
I encountered a similar problem. Then I found circom did not optimize some unused variables away. So I wrote an adhoc script to deal with this. It worked.
import json
j = json.load(open('circuit.r1cs.json'))
cs = j['constraints']
s = set()
for c in cs:
for item in c:
for elem in item:
s.add(elem)
for v in range(j['nVars']):
if str(v) not in s:
j['constraints'].append([{}, {}, {str(v): "1"}])
json.dump(j, open('circuit.r1cs.json.new', 'w'))( Of course, the right solution would be to optimize this in circom and make a PR into it. )
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