fix reverse mode

[oscardssmith]

This already has the error count down to 16 (from 47). The remaining issues appear to all be keyword related

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +29.31 🎉

Comparison is base (096f918) 22.98% compared to head (91cda3d) 52.29%.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #175       +/-   ##
===========================================
+ Coverage   22.98%   52.29%   +29.31%     
===========================================
  Files          27       27               
  Lines        2676     2719       +43     
===========================================
+ Hits          615     1422      +807     
+ Misses       2061     1297      -764     

Impacted Files	Coverage Δ
src/codegen/reverse.jl	92.89% <100.00%> (+92.89%)	⬆️
src/stage1/recurse.jl	96.41% <100.00%> (+84.10%)	⬆️

... and 10 files with indirect coverage changes

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