Perhaps there may be useful ideas in 
https://draugus.github.io/pdf/Software%20Design%20for%20Flexibility%20-%20Chris%20Hanson.pdf
 .

Howard

> On Oct 20, 2023, at 1:23 PM, Ben Gamari <b...@well-typed.com> wrote:
> 
> Ben Gamari <b...@well-typed.com> writes:
> 
>> ...
>> 
>> # Phase 2: Template Haskell
>> 
>> The above story is made considerably messier by `template-haskell`.
>> ...
> 
> One further clarification as I fear this may be unclear:
> 
> Phase 2 does *not* allow multiple versions of `template-haskell` to
> be used with a single GHC. That is, each GHC version will have precisely
> one corresponding `template-haskell` version; consequently, programs
> using TemplateHaskell's combinator's will still need to adapt to new
> `template-haskell` releases when moving to a new GHC.
> 
> Phase 3 describes how we could eliminate this need by allowing multiple
> `template-haskell` versions to be used with a single GHC release.
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