warn unused blocks with Enumerable#all? any? one? none?

[Fix GH-1953]

From: Koji Onishi <fursich0@gmail.com>

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64733 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 3 insertions, 0 deletions

diff --git a/hash.c b/hash.c
index d58e67cf87..32efd02d5a 100644
--- a/hash.c
+++ b/hash.c
@@ -3034,6 +3034,9 @@ rb_hash_any_p(int argc, VALUE *argv, VALUE hash)
     rb_check_arity(argc, 0, 1);
     if (RHASH_EMPTY_P(hash)) return Qfalse;
     if (argc) {
+        if (rb_block_given_p()) {
+            rb_warn("given block not used");
+        }
 	args[1] = argv[0];
 
 	rb_hash_foreach(hash, any_p_i_pattern, (VALUE)args);