# test assigning to iterator within the loop
for i in range(2):
    print(i)
    i = 2

# test assigning to range parameter within the loop
# (since we optimise for loops, this needs checking, currently it fails)
#n = 2
#for i in range(n):
#    print(i)
#    n = 0

Add test for semantics of for-loop that optimisation can break.
tests: Add test for semantics of for-loop that optimisation can break.
