From cd624797f298c2e4f52c6ffed2444ec737a8e59a Mon Sep 17 00:00:00 2001
From: Daiki Kudo <44487754+kudojp@users.noreply.github.com>
Date: Sun, 3 Sep 2023 17:57:40 +0900
Subject: [PATCH] Fix supported Ruby version to be only `3.1.x` (#32)

* Update spec.required_ruby_version = "~> 3.1.0"

* Don't run ci test with ruby 3.0 which is not supported
---
 .github/workflows/ci.yaml | 2 +-
 async_scheduler.gemspec   | 6 +++++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 16c363a..a363478 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -6,7 +6,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest]
-        ruby: [3.0, 3.1]
+        ruby: ['3.1']
     runs-on: ${{ matrix.os }}
     steps:
       - uses: ruby/setup-ruby@v1
diff --git a/async_scheduler.gemspec b/async_scheduler.gemspec
index 9a53171..1b0ce88 100644
--- a/async_scheduler.gemspec
+++ b/async_scheduler.gemspec
@@ -12,7 +12,11 @@ Gem::Specification.new do |spec|
   spec.description = "This is a task scheduler which implements the FiberScheduler interface"
   spec.homepage = "https://github.com/kudojp/async_scheduler"
   spec.license = "MIT"
-  spec.required_ruby_version = ">= 3.0.0"
+  # The interface of FiberScheduler#io_read had a breaking change from Ruby 3.0 to 3.1.
+  # - Ruby 3.0: #io_read takes 4 arguments.
+  # - Ruby 3.1: #io_read takes 3 arguments.
+  # The implementation of scheduler#io_read in this gem takes only 3 arguments.
+  spec.required_ruby_version = "~> 3.1.0"
 
   spec.metadata["allowed_push_host"] = "TODO: Set to your gem server 'https://example.com'"