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Remove useless local functions
>>> import gast as ast
>>> from pythran import passmanager, backend, metadata
>>> pm = passmanager.PassManager("test")
>>> node = ast.parse("def foo(): return 1")
>>> _, node = pm.apply(RemoveDeadFunctions, node)
>>> print(pm.dump(backend.Python, node))
def foo():
return 1
>>> node = ast.parse("def foo(): return 1")
>>> metadata.add(node.body[0], metadata.Local())
>>> _, node = pm.apply(RemoveDeadFunctions, node)
>>> print(pm.dump(backend.Python, node))
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