Huge dependency footprint due to `hashable-1.4.0.0` (via `nats`)

[haskell]

Huge dependency footprint due to `hashable-1.4.0.0` (via `nats`)

[Fuuzetsu]

stm change: ee84fe2
hashable change: haskell-unordered-containers/hashable@b618850

Looking at stm change, it has been the case for 3 years and only impacts compiler versions before 7.10... Seems surprising to hit this now.

[sol]

It's not the stm change that pulled in those dependencies, it's the recent change to hashable.

[bgamari]

stm only depends upon nats when built with rather old GHC versions. Moreover, the hashable dependency of nats is optional via the hashable flag. Perhaps this addresses your concern?

[sol]

In my specific situation it works to just "vendor" a copy of stm-2.5.0.1/Control/Concurrent/STM/TMVar.hs. This is not beautiful but saves me 10 dependencies for older versions of GHC:

• base-orphans
• functor-classes-compat
• generic-deriving
• hashable
• mtl
• nats
• stm
• text
• th-abstraction
• transformers-compat

As for stm depending on nats: It's probably too late to do something about it. However, personally, I can't justify the benefit to weight ratio of that change***.

*** Not only because of the nats dependency, but also because it was technically a breaking change for, by my standards, little tangible benefit.