Add blogpost for HLS 2.10.0.0 release announcement

Author: fendor

content/hls-2.10.0.0/cabal-add-1.png

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+title = "Haskell Language Server 2.10.0.0 release"
+date = 2025-04-07
+[taxonomies]
+authors = ["Fendor"]
+categories = ["HLS"]
+tags = ["Release"]
++++
+
+The HLS Team is proud to announce the new release of the Haskell Language Server `2.10.0.0`!
+
+<!-- more -->
+
+The last release of HLS was quite some time ago, back in July of 2024.
+Thus, this release has quite a number of new features, some of which we would like to highlight for you.
+
+## HLS `2.10.0.0`
+
+The release `2.10.0.0` supports the following GHC versions:
+
+* `9.12.2`
+* `9.10.1`
+* `9.8.4`
+* `9.6.7`
+* `9.4.8`
+
+We expect `2.10.0.0` to be the last HLS release having support for GHC `9.4` versions.
+
+### Go to Implementations
+
+We added support for a new LSP feature called `Go to Implementations`.
+This LSP feature allows you to jump to the implementation of overloaded functions.
+
+<img src="jump-to-implementations.gif" alt="A simple 'Demo' typeclass illustrating that the 'Go to Implementations request sends the cursor to the instance declaration 'Demo Char'." width=70%>
+
+### Inlay Hints
+
+Inlay hints allow you to display additional information within a line of code.
+This can be an elegant alternative to code lenses, which can be a bit more invasive in the editor.
+For GSoC 2024, `jetjiinser` added inlay hints for various Haskell constructs where additional information can be provided.
+
+#### Record Wildcards
+
+When [`RecordWildCards`](https://downloads.haskell.org/ghc/latest/docs/users_guide/exts/record_wildcards.html#extension-RecordWildCards) are enabled, it can be tricky to tell which functions are brought into scope.
+
+Inlay hints are convenient to show exactly which variables have been added to the scope.
+
+<img src="inlay-wildcards.png" alt="Showing the name of record field selectors in record wildcard patterns. One example shows for deconstruction, while the other example shows constructing a record using a wildcard pattern." width=70%>
+
+#### Record construction
+
+One more example showing the convenience of inlay hints.
+
+<img src="inlay-record.png" alt="Constructing a value of type 'MyRec' shows the names of its field." width=70%>
+
+#### Imports
+
+Inlay hints are also an alternative to code lenses in many situations, for example for showing which identifiers are actually used from an `import`:
+
+<img src="inlay-imports.png" alt="Many Haskell import statements, showing the imported identifiers as inlay hints." width=70%>
+
+### `hls-cabal-plugin` features
+
+The `hls-cabal-plugin` provides language features for `.cabal` files.
+
+During GSoC 2024, `VenInf` added many new features to HLS' support for `.cabal` files.
+
+Moreover, during hackathons such as MuniHac and ZuriHac, a lot of other developers also took the time and effort to fix bugs and contribute new features to the `hls-cabal-plugin`.
+
+#### `.cabal` file outline
+
+The outline on the left shows an overview of the contents of a `.cabal` file.
+A small quality-of-life improvement.
+
+<img src="cabal-outline.png" alt="VSCode Editor showing an Outline of the `haskell-language-server.cabal`." width=70%>
+
+#### Support for `cabal-add`
+
+HLS now offers a convenient code action which allows you to add a new dependency to your `.cabal` file, without having to open it yourself.
+
+<img src="cabal-add-1.png" alt="Import of `Data.List.Split` shows an unknown package error. VSCode offers a CodeAction offering to extend the dependency section in the `.cabal` file." width=70%>
+
+After executing the code action, we see that the `.cabal` file has been modified:
+
+<img src="cabal-add-2.png" alt="View of the `.cabal` file where showing a new dependency has been added." width=70%>
+
+#### Hover for Dependencies
+
+A tiny, new feature: hover for dependencies in `.cabal` files.
+It shows a link to the `Hackage` documentation of a package.
+
+<img src="cabal-hover.png" alt="Hover over `split` package shows the name and a link to the Hackage documentation of the `split` package." width=70%>
+
+This is mostly a proof of concept, we expand on this idea in [PR #4428](https://github.com/haskell/haskell-language-server/pull/4428).
+
+### GHC Structured Errors
+
+This release is also the first release which uses GHC's structured errors infrastructure.
+You might not notice this at first as an end-user, as it is a rather technical detail mainly concerned with refactoring internals of HLS to provide many of its features based on structured diagnostics, improving accuracy and maintainability of HLS.
+
+But it also has the useful side effect of allowing us to integrate with [the Haskell Error Index](https://errors.haskell.org/):
+
+<img src="error-index.jpeg" alt="A GHC error message, displaying the error code associated with this particular error message." width=70%>
+
+For anyone wondering how HLS is providing code actions and other LSP features without structured diagnostics... the answer is [lots of GHC version dependent regexes](https://github.com/haskell/haskell-language-server/blob/master/plugins/hls-refactor-plugin/src/Development/IDE/Plugin/CodeAction.hs#L975).
+
+We want to replace most of these regexes with structured errors.
+Do you want to help? Pick an HLS plugin and hack away!
+The [PR #4472](https://github.com/haskell/haskell-language-server/pull/4472) is only the beginning of our efforts!
+
+### Fixed
+
+HLS has lots of bugs. In each release we fix a couple and we introduce a couple of new ones.
+We can't list all bug fixes, so let's just list a few important ones:
+
+* [Bugfix: Explicit record fields inlay hints for polymorphic records](https://github.com/haskell/haskell-language-server/pull/4510)
+* [Implement fallback handler for `*/resolve` requests](https://github.com/haskell/haskell-language-server/pull/4478)
+
+## Thank you, Haskell Community
+
+We wish all Haskellers happy hacking while using the latest release of the Haskell Language Server `2.10.0.0`!
+
+We want to thank our countless contributors from the community and our Google Summer of Code participants!
+This is a community project, and the HLS team is grateful for every contribution, be it documentation, bug fixes or new features.
+
+Finally, a reminder that you can donate to the development of HLS via [OpenCollective](https://opencollective.com/haskell-language-server).
+The OpenCollective money pays for tedious, but important maintenance work and, sometimes, development of new features.