inner function, without creating a special type of function. This reduced
understanding complexity, but also reduced a potential source of bugs ( when
unpickling, or having alias outputs). I also added a new test for the bug
Arnaud discovered, which this fix also adresses in a more broad way.

code that used to set mutable to true will issue a warning without this
fix, because you can not have mutable True and borrow False (default value).
Getting that warning when you only set mutable but not borrow seems very
annoying and unneccessary.

gonna get used but why not)

sync with In.

inserting view_op, a inplace version of deep_copy_op).

gets the same output multiple time.

Ideally, we should replicate lots of things that are in
TensorType.values_eq_approx. See #664.

fixed bug reported by Olivier, by having a typo in the name of the variable when raising an exception ..

throws an exception or silently returns a bunch of 0s)

dictionary and from time to time tried to sync the two. As Josh pointed out,
this was confusing, so I changed the code to use only self. I left the usage
of the info dictionary to construct the op and in __eq__ and __hash__
because at those points I don't care about the individual terms in the
dictionary and it would make the code considerably bigger to spell out all
keys in the info dictionary.