Function as_tensor expected in the definition of a scalar

[j-507]

@dokken

Hi,
Several things strikes me when reading through your code.
First: The power operator is not ^, but **, you should change that throughout your code.
Second: The last part of L1 does not contain a test-function, and will lead to an arity-mismatch. Should probably be multiplied by v.

That was exactly it. Thanks for the help!