rejectedsoftware/vibe.d — pull request #692 by Geod24 (2014-06-19 03:01:45+00:00)
Title: Const DictionaryList

I believe the key parameter was a ref because of: https://issues.dlang.org/show_bug.cgi?id=2443
For the rest, it just allow const DictionaryList!(...) to work.