From 5d917366c9f9d95aeb9e302ecf442249ccd9e51d Mon Sep 17 00:00:00 2001
From: Claude <noreply@anthropic.com>
Date: Tue, 18 Aug 2026 08:48:10 +0000
Subject: [PATCH] Version 4.2.0.pre.1

The first prerelease of the 4.2 line, cut from `master` after 4.1.2.
`Gemfile.lock` is regenerated with the bump, and CHANGELOG.md gains the
4.2.0.pre.1 section.

The changelog starts at `v4.1.2`, the latest tag reachable from `master`,
which is how a prerelease is written up: 4.1.3 was cut from `aaa-4.1.x`,
so the two changes it backported are listed here under the pull requests
they were written in.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LrJnRwFjCYw9h5U8LkRqqP
---
 CHANGELOG.md       | 27 +++++++++++++++++++++++++++
 Gemfile.lock       |  2 +-
 lib/rbs/version.rb |  2 +-
 3 files changed, 29 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 566b88224..2138096f0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,32 @@
 # CHANGELOG
 
+## 4.2.0.pre.1 (2026-08-18)
+
+### Language updates
+
+* Gate forwarding parameter syntax behind parser option ([#3087](https://github.com/ruby/rbs/pull/3087))
+* Support non-ASCII identifiers ([#3082](https://github.com/ruby/rbs/pull/3082))
+* Support forwarding parameters in method types ([#3042](https://github.com/ruby/rbs/pull/3042))
+
+### Library changes
+
+* Stop the lexer reading past the end of a byte_range ([#3040](https://github.com/ruby/rbs/pull/3040))
+* Exclude CR from comment tokens to fix an off-by-one Location#end_line on CRLF files ([#3069](https://github.com/ruby/rbs/pull/3069))
+* Handle the NULL parser in the WebAssembly shim ([#3085](https://github.com/ruby/rbs/pull/3085))
+* Reject a byte position the lexer cannot start on ([#3083](https://github.com/ruby/rbs/pull/3083))
+* Don't use Clang nullability qualifiers in strict ISO C mode ([#3074](https://github.com/ruby/rbs/pull/3074))
+* Avoid eagerly inspecting call traces in type assertions ([#3073](https://github.com/ruby/rbs/pull/3073))
+* Fix TypeParam.rename to substitute variables in bounds and default types ([#3068](https://github.com/ruby/rbs/pull/3068))
+* Extract per-declaration type param alignment into entry-level align_params ([#3070](https://github.com/ruby/rbs/pull/3070))
+* Align type params across declarations in module-self types and superclass validation ([#3067](https://github.com/ruby/rbs/pull/3067))
+* Build the wasm module with -DNDEBUG ([#3066](https://github.com/ruby/rbs/pull/3066))
+* Rename NODISCARD macro to RBS_NODISCARD ([#3065](https://github.com/ruby/rbs/pull/3065))
+
+### Miscellaneous
+
+* Skip JSON 2-only tests with JSON 3 ([#3084](https://github.com/ruby/rbs/pull/3084))
+* Pin GitHub Actions to commit hashes ([#3020](https://github.com/ruby/rbs/pull/3020))
+
 ## 4.1.3 (2026-08-10)
 
 ### Miscellaneous
diff --git a/Gemfile.lock b/Gemfile.lock
index d0019f3c3..e7291617e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -22,7 +22,7 @@ GIT
 PATH
   remote: .
   specs:
-    rbs (4.2.0.dev)
+    rbs (4.2.0.pre.1)
       logger
       prism (>= 1.6.0)
       tsort
diff --git a/lib/rbs/version.rb b/lib/rbs/version.rb
index db11861cd..44c4b5bce 100644
--- a/lib/rbs/version.rb
+++ b/lib/rbs/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module RBS
-  VERSION = "4.2.0.dev"
+  VERSION = "4.2.0.pre.1"
 end