Eta v0.8.6

Reproducible builds

Eta now supports reproducibility by default. If you need details on how to see this in action, check out this gist.

We've upgraded to base-4.11.1.0 to support the newer hackage packages.

In order to support better extensibility at compile-time while keeping good performance we took sometime to port Backpack into Eta.

Eta now supports ApplicativeDo, Strict, and StrictData language extensions.

Servant, Scotty, Spock, Yesod, and Warp work in Eta.

For more information check out this page

We’ve backported GHC 8’s pattern match checker which performs intelligent exhaustiveness checking, especially for GADTs.

Warnings now give a proper context showing you exactly which flags enable the warning in the first place, making day-to-day usage a bit smoother.

Concurrent Runtime: We did a stress test on a simple Warp server by flooding it with requests to see whether there were any concurrent bugs we needed to fix. We found a few and the fixes are included in this release. There are currently known issues with Eta apps hogging the CPU, which will be fixed by the next release.
Memory Manager: The memory manager is part of the runtime responsible for allocating off-heap memory. There were some concurrent bugs discovered and fixed in this release.
StackOverflowErrors: In the process of making PureScript work with Eta we discovered some gaps in our trampolining mechanism. We fixed those allowing you to use the trampoline function to handle a wider class of StackOverflowErrors.
TemplateHaskell: They were several minor bugs in TemplateHaskell that lead to strange type errors. These have been fixed in this release.

For more details on this release check out the blog post.