def test_mappers():
from pymbolic import variables
f, x, y, z = variables("f x y z")
for expr in [f(x, (y, z), name=z**2)]:
from pymbolic.mapper import WalkMapper
from pymbolic.mapper.dependency import DependencyMapper
str(expr)
IdentityMapper()(expr)
WalkMapper()(expr)
DependencyMapper()(expr)
def test_structure_preservation():
x = prim.Sum((5, 7))
from pymbolic.mapper import IdentityMapper
x2 = IdentityMapper()(x)
assert x == x2
