templating

What steps did you take:

Input:

#@ def group_alpha():
name: alpha
#@ end
groups: &all_groups
  - #@ group_alpha()
foo:
  groups: *all_groups

Result:

groups:
- null
foo:
  groups:
  - name: alpha

Expected:

groups:
- alpha
foo:
  groups:
  - name: alpha

Expected according to [limitations](https://carvel.dev/ytt/docs/latest/known-limitat

Expected Behaviour

The following should generate a Rancher Rio Service definition:

faas-cli generate --api=services.rio.cattle.io

apiVersion: rio.cat

I struggled quite a lot to find this issue but as cruft is modifying the diff results from git diff taking as assumption paths start by a/ and b/ , it does not work well if the global configuration diff.mnemonicprefix is set to true.

A fix might be to force the configuration diff.mnemonicprefix=false in method https://github.com/cruft/cruft/blob/3ec724634d8509d37164f2473ddf8674f072474