Series raises an error at infinity for an example which can be solved by aseries

[0sidharth]

As the title suggests -

In [1]: a = sin(1/x + exp(-x)) - sin(1/x)

In [2]: a
Out[2]: 
     ⎛1⎞      ⎛ -x   1⎞
- sin⎜─⎟ + sin⎜ℯ   + ─⎟
     ⎝x⎠      ⎝      x⎠

In [3]: a.series(x, oo)
---------------------------------------------------------------------------
PoleError                                 Traceback (most recent call last)

(truncated)

PoleError: Cannot expand sin(_x + exp(-1/_x)) around 0

In [4]: a.aseries(x)
Out[4]: 
⎛  1      1          ⎛1        ⎞⎞  -x
⎜───── - ──── + 1 + O⎜──; x → ∞⎟⎟⋅ℯ  
⎜    4      2        ⎜ 6       ⎟⎟    
⎝24⋅x    2⋅x         ⎝x        ⎠⎠    

If aseries is able to calculate the answer, series should call it and return that.