Checks SBCL (cl:expt -0 -∞)

[y2q-actionman]

Quoted from Issue #6.

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I see Allegro CL 10.1 on MacOSX 11.2.3 raises an error like Lispworks:

CL-USER(5): (expt -0.0 excl:negative-infinity-double) Error: attempt to raise 0.0 to non-positive power [condition type: SIMPLE-ERROR]

But, SBCL 2.1.4 does not so:

• (expt -0.0 sb-ext:double-float-negative-infinity) #.DOUBLE-FLOAT-POSITIVE-INFINITY

I'm going to look into SBCL when I have time.