Charting a course toward a stable API for GHC

The Haskell ecosystem has accumulated a wealth of developer tools over the years. Some of them, such as Hoogle and HLint, have existed for nearly two decades, while others, such as the Haskell Language Server and Retrie, are much more recent. GHC has changed substantially in that time, and this presents a significant challenge to tooling authors saddled with the burden of keeping their tools up to date...