I have to deal with this issue in the htdp package because good error messages 
are critical for students. I have experimented with 

 — who passing (still there)
 — exns (still there) 

and found that manually picking the right exported function to blame is the 
'right thing’ when beginners are the clients of my library. I resort to the 
above only when _bar is used equally by two different entry points into the 
library. 

If this is really your main problem, consider re-defining #%lambda and #%app to 
implement who-passing systematically. 

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