Release post for 1.10.0

_releases/2023-10-09-1.10.0-released.md

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+---
+title: Crystal 1.10.0 is released!
+version: 1.10.0
+summary:
+thumbnail: +
+author: straight-shoota
+---
+
+We are delivering a new Crystal release with several bugfixes and improvements.
+
+Pre-built packages are available on [GitHub Releases](https://github.com/crystal-lang/crystal/releases/tag/1.10.0)
+and our official distribution channels.
+See [crystal-lang.org/install](https://crystal-lang.org/install/) for
+installation instructions.
+
+## Stats
+
+This release includes [82 changes since 1.9.2](https://github.com/crystal-lang/crystal/pulls?q=is%3Apr+milestone%3A1.10.0)
+by 21 contributors. We thank all the contributors for all the effort put into
+improving the language! ❤️
+
+## Changes
+
+Below we list the most remarkable changes in the language, compiler and stdlib.
+For more details, visit the [changelog](https://github.com/crystal-lang/crystal/releases/tag/1.10.0).
+
+This release does not bring any big impact changes, but smaller enhancements and
+bug fixes, stabilizing the compiler and standard library.
+
+### Unlimited block unpacking
+
+The most notable language change is the introduction of unlimited block
+unpacking ([#11597](https://github.com/crystal-lang/crystal/pull/11597)).
+
+Block parameter unpacking can now be nested.
+
+```crystal
+ary = [
+  {1, {2, {3, 4}}},
+]
+
+ary.each do |(w, (x, (y, z)))|
+  w # => 1
+  x # => 2
+  y # => 3
+  z # => 4
+end
+```
+
+Splat parameters are also supported.
+
+```crystal
+ary = [
+  [1, 2, 3, 4, 5],
+]
+
+ary.each do |(x, *y, z)|
+  x # => 1
+  y # => [2, 3, 4]
+  z # => 5
+end
+```
+
+### Breaking: `crystal spec` exists with failure when focused
+
+If the spec suite has any examples with `focus: true`, the spec process will
+always exit with a failure code. Even if all executed specs succeed.
+This is to prevent CI success when a `focus: true` is accidentally commited. ([#13653](https://github.com/crystal-lang/crystal/pull/13653))
+
+### Compiler tools: `dependencies` and `unreachable`
+
+Two new compiler tools are available for analyzing the program source.
+
+* [`crystal tool dependencies`](https://crystal-lang.org/reference/1.10/man/crystal#crystal-tool-dependencies)
+  prints a tree of required source files. This can be useful for separating
+  source trees or debugging issues with require order.
+* [`crystal tool unreachable`](https://crystal-lang.org/reference/1.10/man/crystal#crystal-tool-unreachable)
+  prints methods that are defined but never called. This can help cleaning up
+  unused code.
+
+### Deprecations
+
+* `HTTP::StaticFileHandler.new` parameters `fallthrough` and `directory_listing`
+   other type than `Bool`.