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RangeLoopUnfolding turns unfolded range of non unrolled loops back to range.
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Turns iteration over an incrementing list of literals into a range
>>> import gast as ast
>>> from pythran import passmanager, backend
>>> node = ast.parse("for i in [1,2,3]: print(i)")
>>> pm = passmanager.PassManager("test")
>>> _, node = pm.apply(RangeLoopUnfolding, node)
>>> print(pm.dump(backend.Python, node))
for i in builtins.range(1, 4, 1):
print(i)
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