compile.c: fix catch-table labels optimization

* compile.c (remove_unreachable_chunk): do not eliminate chunks
  followed by labels in catch-table entries.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58810 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 8 insertions, 0 deletions

diff --git a/test/ruby/test_optimization.rb b/test/ruby/test_optimization.rb
index 910dc30c35..2d0eec02fd 100644
--- a/test/ruby/test_optimization.rb
+++ b/test/ruby/test_optimization.rb
@@ -567,4 +567,12 @@ class TestRubyOptimization < Test::Unit::TestCase
       assert_equal(:ok, t)
     end
   end
+
+  def test_retry_label_in_unreachable_chunk
+    bug = '[ruby-core:81272] [Bug #13578]'
+    assert_valid_syntax("#{<<-"begin;"}\n#{<<-"end;"}", bug)
+    begin;
+      def t; if false; case 42; when s {}; end; end; end
+    end;
+  end
 end