https://git.ruby-lang.org/ruby.git/commit/?id=267bed0cd9

From 267bed0cd91711e2a8c79219e97431ba22137b01 Mon Sep 17 00:00:00 2001
From: Benoit Daloze <eregontp@g...>
Date: Sun, 27 Dec 2020 17:35:30 +0100
Subject: Update to ruby/mspec@a40a674


diff --git a/spec/mspec/README.md b/spec/mspec/README.md
index d4054bc..e334d56 100644
--- a/spec/mspec/README.md
+++ b/spec/mspec/README.md
@@ -53,7 +53,7 @@ To install the gem dependencies with Bundler, run the following: https://github.com/ruby/ruby/blob/trunk/spec/mspec/README.md#L53
 ruby -S bundle install
 ```
 
-## Running Specs
+## Development
 
 Use RSpec to run the MSpec specs. There are no plans currently to make the
 MSpec specs runnable by MSpec: https://github.com/ruby/mspec/issues/19.
diff --git a/spec/mspec/lib/mspec/utils/script.rb b/spec/mspec/lib/mspec/utils/script.rb
index e3478ef..5c6ae70 100644
--- a/spec/mspec/lib/mspec/utils/script.rb
+++ b/spec/mspec/lib/mspec/utils/script.rb
@@ -38,9 +38,7 @@ class MSpecScript https://github.com/ruby/ruby/blob/trunk/spec/mspec/lib/mspec/utils/script.rb#L38
   end
 
   def initialize
-    ruby_version_is ""..."2.5" do
-      abort "MSpec needs Ruby 2.5 or more recent"
-    end
+    check_version!
 
     config[:formatter] = nil
     config[:includes]  = []
@@ -280,4 +278,10 @@ class MSpecScript https://github.com/ruby/ruby/blob/trunk/spec/mspec/lib/mspec/utils/script.rb#L278
     require 'mspec'
     script.run
   end
+
+  private def check_version!
+    ruby_version_is ""..."2.5" do
+      warn "MSpec is supported for Ruby 2.5 and above only"
+    end
+  end
 end
diff --git a/spec/mspec/lib/mspec/utils/warnings.rb b/spec/mspec/lib/mspec/utils/warnings.rb
index 288dbe7..c770d60 100644
--- a/spec/mspec/lib/mspec/utils/warnings.rb
+++ b/spec/mspec/lib/mspec/utils/warnings.rb
@@ -1,9 +1,12 @@ https://github.com/ruby/ruby/blob/trunk/spec/mspec/lib/mspec/utils/warnings.rb#L1
 require 'mspec/guards/version'
 
 # Always enable deprecation warnings when running MSpec, as ruby/spec tests for them,
-# and like in most test frameworks, all warnings should be enabled by default (same as -w).
+# and like in most test frameworks, deprecation warnings should be enabled by default,
+# so that deprecations are noticed before the breaking change.
+# Disable experimental warnings, we want to test new experimental features in ruby/spec.
 if Object.const_defined?(:Warning) and Warning.respond_to?(:[]=)
   Warning[:deprecated] = true
+  Warning[:experimental] = false
 end
 
 if Object.const_defined?(:Warning) and Warning.respond_to?(:warn)
@@ -39,15 +42,6 @@ if Object.const_defined?(:Warning) and Warning.respond_to?(:warn) https://github.com/ruby/ruby/blob/trunk/spec/mspec/lib/mspec/utils/warnings.rb#L42
     when /passing a block to String#(bytes|chars|codepoints|lines) is deprecated/
     when /core\/string\/modulo_spec\.rb:\d+: warning: too many arguments for format string/
     when /regexp\/shared\/new_ascii(_8bit)?\.rb:\d+: warning: Unknown escape .+ is ignored/
-
-    # $VERBOSE = false warnings
-    when /constant ::(Fixnum|Bignum) is deprecated/
-    when /\/(argf|io|stringio)\/.+(ARGF|IO)#(lines|chars|bytes|codepoints) is deprecated/
-    when /Thread\.exclusive is deprecated.+\n.+thread\/exclusive_spec\.rb/
-    when /hash\/shared\/index\.rb:\d+: warning: Hash#index is deprecated; use Hash#key/
-    when /exponent(_spec)?\.rb:\d+: warning: in a\*\*b, b may be too big/
-    when /enumerator\/(new_spec|initialize_spec)\.rb:\d+: warning: Enumerator\.new without a block is deprecated/
-    when /Pattern matching is experimental, and the behavior may change in future versions of Ruby!/
     else
       $stderr.write message
     end
diff --git a/spec/mspec/tool/sync/sync-rubyspec.rb b/spec/mspec/tool/sync/sync-rubyspec.rb
index 93e0f53..7f3dc0e 100644
--- a/spec/mspec/tool/sync/sync-rubyspec.rb
+++ b/spec/mspec/tool/sync/sync-rubyspec.rb
@@ -1,3 +1,6 @@ https://github.com/ruby/ruby/blob/trunk/spec/mspec/tool/sync/sync-rubyspec.rb#L1
+# This script is based on commands from the wiki:
+# https://github.com/ruby/spec/wiki/Merging-specs-from-JRuby-and-other-sources
+
 IMPLS = {
   truffleruby: {
     git: "https://github.com/oracle/truffleruby.git",
@@ -173,7 +176,7 @@ def test_new_specs https://github.com/ruby/ruby/blob/trunk/spec/mspec/tool/sync/sync-rubyspec.rb#L176
     versions = versions.grep(/^\d+\./) # Test on MRI
     min_version, max_version = versions.minmax
 
-    test_command = MSPEC ? "bundle exec rspec" : "../mspec/bin/mspec -j"
+    test_command = MSPEC ? "bundle install && bundle exec rspec" : "../mspec/bin/mspec -j"
 
     run_test = -> version {
       command = "chruby #{version} && #{test_command}"
-- 
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