bugfix in compile and add merge_multi_product

[houpc]

No description provided.

[codecov-commenter]

Codecov Report

Attention: 23 lines in your changes are missing coverage. Please review.

Comparison is base (9147ef0) 64.19% compared to head (84217b3) 64.15%.
Report is 2 commits behind head on computgraph.

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@               Coverage Diff               @@
##           computgraph     #145      +/-   ##
===============================================
- Coverage        64.19%   64.15%   -0.04%     
===============================================
  Files               56       56              
  Lines             3854     3909      +55     
===============================================
+ Hits              2474     2508      +34     
- Misses            1380     1401      +21     

Files	Coverage Δ
src/FeynmanDiagram.jl	75.00% <ø> (ø)
src/computational_graph/ComputationalGraph.jl	100.00% <ø> (ø)
src/computational_graph/transform.jl	97.28% <93.75%> (-0.75%)	⬇️
src/backend/static.jl	39.36% <50.00%> (+0.98%)	⬆️
src/computational_graph/optimize.jl	86.25% <0.00%> (-8.93%)	⬇️

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