insns.def: cache nil const

* insns.def (getinlinecache): Qnil is a valid value as a constant.
  this can be observable when accessing a deprecated constant
  which is nil.  non-nil constant is warned just once for each
  location, but every time if it is nil.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62350 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 11 insertions, 0 deletions

diff --git a/test/ruby/test_module.rb b/test/ruby/test_module.rb
index 9980844eb4..1b04b954af 100644
--- a/test/ruby/test_module.rb
+++ b/test/ruby/test_module.rb
@@ -1429,6 +1429,17 @@ class TestModule < Test::Unit::TestCase
     assert_warn(/deprecated/, bug12382) {c.class_eval "FOO"}
   end
 
+  NIL = nil
+  FALSE = false
+  deprecate_constant(:NIL, :FALSE)
+
+  def test_deprecate_nil_constant
+    w = EnvUtil.verbose_warning {2.times {FALSE}}
+    assert_equal(1, w.scan("::FALSE").size, w)
+    w = EnvUtil.verbose_warning {2.times {NIL}}
+    assert_equal(1, w.scan("::NIL").size, w)
+  end
+
   def test_constants_with_private_constant
     assert_not_include(::TestModule.constants, :PrivateClass)
     assert_not_include(::TestModule.constants(true), :PrivateClass)