unXFAIL matrix test
lambdify preserves args shape

You can call a lambdified function with arguments having the
same shape as those that were sent to lambdify:

>>> f = lambdify((a, (b, c)), a + b*c)
>>> f(1, (2, 3))
7
Merge pull request #2809 from smichr/2790

lambdify preserves arg shape