New issue 2946: Raising ints to negative numbers casts first to longs and then
to floats
https://bitbucket.org/pypy/pypy/issues/2946/raising-ints-to-negative-numbers-casts
Julian Berman:
Code:
```python
def main():
s = 0.0
for i in range(1, 100000):
s += i ** -2
return s
main()
```
Trace:
```
debug_merge_point(0, 0, '<code object main. file 'x.py'. line 1> #37
BINARY_POWER')
+699: guard_not_invalidated(descr=<Guard0x10955b028>) [p0, p3, p6, p7, p10,
p14, p18, p20, p1, i37]
+699: p43 = call_r(ConstClass(fromint), i37, descr=<Callr 8 i EF=4>)
+803: guard_no_exception(descr=<Guard0x109566980>) [p0, p6, p7, p10, p14, p1,
p43, i37]
+817: f45 = call_f(ConstClass(rbigint.tofloat), p43, descr=<Callf 8 r EF=4>)
```
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