Capture source location for iterator access

[pfultz2]

[codecov[bot]]

Codecov Report

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

Project coverage is 92.26%. Comparing base (5510d75) to head (2d132b0). Report is 151 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff              @@
##           develop    #3336       +/-   ##
============================================
+ Coverage         0   92.26%   +92.26%     
============================================
  Files            0      500      +500     
  Lines            0    20048    +20048     
============================================
+ Hits             0    18497    +18497     
- Misses           0     1551     +1551     

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