apfl/functional_tests/function-mutable-capture.at

=== script ===
counter = {
    i = 0
    { i = i + 1 }
}

c1 = (counter)
c2 = (counter)

print (c1)
print (c2)
print (c1)
print (c2)
print (c2)
print (c1)
print (c2)

=== output ===
1
1
2
2
3
3
4