substitute_names -> inject_types

This does three things:
1. rename the substitute_names function into inject_types, and makes
   it accept anything that implements IntoIterator instead of just HashMaps
2. adds an extra function to inject just a single type
3. makes these functions chainable; before, each call to
   substitute_names would discard previous invocations. However, this
   currently comes at the cost of a lot of ugly copying.

also, more tests!

0 files changed, 0 insertions, 0 deletions