optional doctest failure -- kash interface (trivial to fix)

[williamstein]

sage -t -long --optional devel/sage/sage/interfaces/kash.py
**********************************************************************
File "/scratch/wstein/build/sage-4.0.2.alpha3/devel/sage-main/sage/interfaces/kash.py", line 68:
    sage: a = kash('(9 - 7) * (5 + 6)'); a              # optional -- kash
Expected nothing
Got:
    22
**********************************************************************
1 items had failures:
   1 of 103 in __main__.example_0
***Test Failed*** 1 failures.

Component: packages: optional

Issue created by migration from https://trac.sagemath.org/ticket/6335

[KPanComputes]

comment:1

On my Sage 5.7.beta4, all tests pass.

sage -t  "devel/sage-main/sage/interfaces/kash.py"          
	 [17.2 s]
 
----------------------------------------------------------------------
All tests passed!
Total time for all tests: 17.4 seconds

So, I am marking this invalid.

[KPanComputes]

comment:2

Oops!! There are two optional tests failing now!! So, not invalid.