Understanding the Haskell profiler - what is == _ a3JO

Question

I am writing some kind of optimization application in Haskell, and I just ran it through the profiler. I see many functions and the strange symbol "== _ a3JO" (sometimes different numbers and booklets). What does it mean?

Output Example:

maxDistanceRaw Igc 360 471912 5.2 5.7 19.8 20.3 distance Igc 364 30143010 1.3 1.0 14.6 14.6 distanceRad Igc 365 30143010 10.4 8.8 13.3 13.6 ==_a3JO Igc 366 30143010 2.9 4.9 2.9 4.9 ==_a3JO Igc 350 233432454 35.3 36.9 35.3 36.9 

Answer 1

Does distanceRad an Eq instance as an argument? I only used the profiler several times, but it looks like an implementation of the instance (==) , which was called unique.

(Posting code may help.)