Signal.list deduplicates keys

This allows us to reuse string objects used in symbols as well
as any string representations of signal names in source code.

* signal.c (sig_list): use fstring for hash key
* test/ruby/test_signal.rb (test_signal_list_dedupe_keys): added

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53657 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 6 insertions, 0 deletions

diff --git a/test/ruby/test_signal.rb b/test/ruby/test_signal.rb
index 13d52013b0..c48a4ad400 100644
--- a/test/ruby/test_signal.rb
+++ b/test/ruby/test_signal.rb
@@ -301,4 +301,10 @@ EOS
       assert_ruby_status(['-e', 'Process.kill(:CONT, $$)'])
     end
   end if Process.respond_to?(:kill)
+
+  def test_signal_list_dedupe_keys
+    a = Signal.list.keys.map(&:object_id).sort
+    b = Signal.list.keys.map(&:object_id).sort
+    assert_equal a, b
+  end
 end