https://git.ruby-lang.org/ruby.git/commit/?id=cb84824481

From cb84824481f205d5c057fe2e31776d40a6b06c7c Mon Sep 17 00:00:00 2001
From: Takashi Kokubun <takashikkbn@g...>
Date: Thu, 1 Aug 2019 19:42:48 +0900
Subject: Add a test for opt_nil_p


diff --git a/test/ruby/test_jit.rb b/test/ruby/test_jit.rb
index 727043f..24ab7fc 100644
--- a/test/ruby/test_jit.rb
+++ b/test/ruby/test_jit.rb
@@ -43,7 +43,7 @@ class TestJIT < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_jit.rb#L43
     if $VERBOSE && !defined?(@@at_exit_hooked)
       at_exit do
         unless TestJIT.untested_insns.empty?
-          warn "untested insns are found!: #{TestJIT.untested_insns.join(' ')}"
+          warn "you may want to add tests for following insns, when you have a chance: #{TestJIT.untested_insns.join(' ')}"
         end
       end
       @@at_exit_hooked = true
@@ -365,6 +365,13 @@ class TestJIT < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_jit.rb#L365
     end;
   end
 
+  def test_compile_insn_opt_nil_p
+    assert_compile_once("#{<<~"begin;"}\n#{<<~"end;"}", result_inspect: 'false', insns: %i[opt_nil_p])
+    begin;
+      nil.nil?.nil?
+    end;
+  end
+
   def test_compile_insn_opt_str_uminus
     assert_compile_once("#{<<~"begin;"}\n#{<<~"end;"}", result_inspect: '"bar"', insns: %i[opt_str_uminus])
     begin;
-- 
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