bloomberg/bsl — pull request #23 by apaprocki (2012-11-17 20:22:54+00:00)
Title: Fixes -Wunused warning.

Fixes:

```
../groups/bsl/bslalg/bslalg_typetraitnil.t.cpp: In function ‘int main(int, char**)’:
../groups/bsl/bslalg/bslalg_typetraitnil.t.cpp:122: warning: unused variable ‘mX’ [-Wunused-variable]
```

Adds `BSLS_ANNOTATION_UNUSED` to prevent the warning.