use varname_leaves from AbstractPPL instead

[penelopeysm]

closes #1028

functions were moved to AbstractPPL in TuringLang/AbstractPPL.jl#134

[github-actions]

Benchmark Report for Commit 024ced9

Computer Information

Julia Version 1.11.6
Commit 9615af0f269 (2025-07-09 12:58 UTC)
Build Info:
  Official https://julialang.org/ release
Platform Info:
  OS: Linux (x86_64-linux-gnu)
  CPU: 4 × AMD EPYC 7763 64-Core Processor
  WORD_SIZE: 64
  LLVM: libLLVM-16.0.6 (ORCJIT, znver3)
Threads: 1 default, 0 interactive, 1 GC (on 4 virtual cores)

Benchmark Results

|                 Model | Dimension |  AD Backend |      VarInfo Type | Linked | Eval Time / Ref Time | AD Time / Eval Time |
|-----------------------|-----------|-------------|-------------------|--------|----------------------|---------------------|
| Simple assume observe |         1 | forwarddiff |             typed |  false |                  8.9 |                 1.6 |
|           Smorgasbord |       201 | forwarddiff |             typed |  false |                665.4 |                42.2 |
|           Smorgasbord |       201 | forwarddiff | simple_namedtuple |   true |                438.1 |                52.8 |
|           Smorgasbord |       201 | forwarddiff |           untyped |   true |               1149.2 |                31.2 |
|           Smorgasbord |       201 | forwarddiff |       simple_dict |   true |               6647.7 |                28.7 |
|           Smorgasbord |       201 | reversediff |             typed |   true |               1508.2 |                28.6 |
|           Smorgasbord |       201 |    mooncake |             typed |   true |               1084.9 |                 4.4 |
|    Loop univariate 1k |      1000 |    mooncake |             typed |   true |               5991.7 |                 4.3 |
|       Multivariate 1k |      1000 |    mooncake |             typed |   true |                988.8 |                 9.1 |
|   Loop univariate 10k |     10000 |    mooncake |             typed |   true |              67218.4 |                 3.8 |
|      Multivariate 10k |     10000 |    mooncake |             typed |   true |               8423.5 |                10.2 |
|               Dynamic |        10 |    mooncake |             typed |   true |                135.5 |                11.8 |
|              Submodel |         1 |    mooncake |             typed |   true |                 14.0 |                 5.0 |
|                   LDA |        12 | reversediff |             typed |   true |               1702.5 |                 1.5 |

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.89%. Comparing base (2d18ce3) to head (024ced9).
⚠️ Report is 1 commits behind head on breaking.

Additional details and impacted files

@@             Coverage Diff              @@
##           breaking    #1030      +/-   ##
============================================
+ Coverage     82.53%   82.89%   +0.35%     
============================================
  Files            39       39              
  Lines          4008     3969      -39     
============================================
- Hits           3308     3290      -18     
+ Misses          700      679      -21     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[github-actions]

DynamicPPL.jl documentation for PR #1030 is available at:
https://TuringLang.github.io/DynamicPPL.jl/previews/PR1030/