hashdist/hashdist — pull request #182 by ahmadia (2014-01-23 15:48:22+00:00)
Title: Implicit package parameters (default '')

This allows implicit package-level parameter substitution.

This behavior is inferior to defining explicit parameter defaults,
see comments by @dagss:
https://github.com/hashdist/hashdist/pull/170#issuecomment-31699208