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, 1 insertions, 1 deletions

diff --git a/signal.c b/signal.c
index cac90db69c..492e682660 100644
--- a/signal.c
+++ b/signal.c
@@ -1347,7 +1347,7 @@ sig_list(void)
     const struct signals *sigs;
 
     for (sigs = siglist; sigs->signm; sigs++) {
-	rb_hash_aset(h, rb_str_new2(sigs->signm), INT2FIX(sigs->signo));
+	rb_hash_aset(h, rb_fstring_cstr(sigs->signm), INT2FIX(sigs->signo));
     }
     return h;
 }