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/array.c b/array.c
index 3c84a7b0b8..813605226f 100644
--- a/array.c
+++ b/array.c
@@ -5809,6 +5809,9 @@ rb_ary_any_p(int argc, VALUE *argv, VALUE ary)
     rb_check_arity(argc, 0, 1);
     if (!len) return Qfalse;
     if (argc) {
+        if (rb_block_given_p()) {
+            rb_warn("given block not used");
+        }
 	for (i = 0; i < RARRAY_LEN(ary); ++i) {
 	    if (RTEST(rb_funcall(argv[0], idEqq, 1, RARRAY_AREF(ary, i)))) return Qtrue;
 	}