compile.c: move logop DCE

* compile.c (iseq_peephole_optimize): remove unreachable code
  chunk after jump/leave.
* parse.y: move dead code elimination of logical operation to
  compile.c.  not to warn logical operation of literal constants.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52711 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 12 insertions, 0 deletions

diff --git a/test/ruby/test_syntax.rb b/test/ruby/test_syntax.rb
index 985a46b532..e2cd389a07 100644
--- a/test/ruby/test_syntax.rb
+++ b/test/ruby/test_syntax.rb
@@ -633,6 +633,18 @@ eom
     assert_valid_syntax("a\n&.foo")
   end
 
+  def test_no_warning_logop_literal
+    assert_warning("") do
+      eval("true||raise;nil")
+    end
+    assert_warning("") do
+      eval("false&&raise;nil")
+    end
+    assert_warning("") do
+      eval("''||raise;nil")
+    end
+  end
+
   private
 
   def not_label(x) @result = x; @not_label ||= nil end