rust-lang/rust — pull request #15958 by hirschenberger (2014-07-24 21:51:50+00:00)
Title: Fix display of `-NaN%` in borrock stats caused by div by zero

`rustc -Z borrowck-stats` displays ugly `-NaN%` in the stats

```
paths requiring guarantees: 0
paths requiring loans : 0 (-NaN%)
paths requiring imm loans : 0 (-NaN%)
stable paths : 0 (-NaN%)
```