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It also turn globals assignment in function definition.
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Expands all builtins into full paths.
>>> import gast as ast
>>> from pythran import passmanager, backend
>>> node = ast.parse('''
... a = 1
... def foo():
... return a''')
>>> pm = passmanager.PassManager("test")
>>> _, node = pm.apply(ExpandGlobals, node)
>>> print(pm.dump(backend.Python, node))
def a():
return 1
def foo():
return a()
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