[Haskell-cafe] Is there a way to make this code compose generic ?

[PICCA Frederic-Emmanuel]

> In principle there shouldn't be any impact on performance. Type classes are
> resolved at compile time, and you only use the generic implementations at known
> types. All of the relevant dictionaries are known at compile-time, so with
> enough inlining and simplification the generic constructors and other
> indirections should be eliminated.
> In practice, inlining is still very heuristic, so you have to look at the
> generated code and maybe add INLINEABLE annotations and tweak other things to
> make sure it happens. The inspection-testing library
> (https://hackage.haskell.org/package/inspection-testing) enables automated
> tests that make sure that the code optimized by the compiler doesn't contain
> certain constructs that indicate missed inlining opportunities.


Thanks a lot, I will use this  and see what is going one.

Fred