I was just surprised by the undocumented behaviour of Symbol:
def __call__(self, *args):
from .function import Function
return Function(self.name)(*args)
this is bad style in my humble opinion. The implicit creation of another
type (Function) is confusing
and very far from the zen of Python (explicit is bettter than implicit).
Any it prevents duck-typing checks
using ``callable``. Do people find this useful? I think it should be
discouraged and even deprecated.
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