Recurse rewrite_generic into :if and :block

[odow]

Closes #302

• [ ] Needs tests etc

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 91.85%. Comparing base (bc97807) to head (1095d21). Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #303      +/-   ##
==========================================
+ Coverage   91.74%   91.85%   +0.11%     
==========================================
  Files          23       23              
  Lines        2216     2246      +30     
==========================================
+ Hits         2033     2063      +30     
  Misses        183      183              

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