Update to ruby/mspec@a40a674

spec/mspec/README.md

@@ -53,7 +53,7 @@ To install the gem dependencies with Bundler, run the following:
 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.

spec/mspec/lib/mspec/utils/script.rb

@@ -38,9 +38,7 @@ class MSpecScript
   end
 
   def initialize
-    ruby_version_is ""..."2.5" do
+    check_version!
-      abort "MSpec needs Ruby 2.5 or more recent"
-    end
 
     config[:formatter] = nil
     config[:includes]  = []
@@ -280,4 +278,10 @@ class MSpecScript
     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

spec/mspec/lib/mspec/utils/warnings.rb

@@ -1,9 +1,12 @@
 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)
     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

spec/mspec/tool/sync/sync-rubyspec.rb

@@ -1,3 +1,6 @@
+# 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
     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}"