On Thu, Oct 27, 2011 at 7:04 AM, Evan Laforge
No, this lists all the instances of a class. OP asked for the classes of which a given type is an instace.
Presumably it is possible, since Haddock does it! In the documentation generated for a type it lists classes of which the type is an instance. So you might want to look at how Haddock does it. I suspect the only way is through the GHC API.
ghci :info does it too.
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Generally looked into GHC's source, seems like the :info (line 850 of compiler/main/InteractiveEval.hs) is internal function. At last, GHC parsed the code, it sure knew the type info. -- 竹密岂妨流水过 山高哪阻野云飞