eval.c: clear internal errinfo

* eval.c (ruby_cleanup): clear internal error info when invoking
  end procs.  [ruby-core:91731] [Bug #15650]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67201 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

eval.c

@@ -188,6 +188,7 @@ ruby_cleanup(volatile int ex)
 
       step_0: step++;
 	errs[1] = th->ec->errinfo;
+        if (THROW_DATA_P(th->ec->errinfo)) th->ec->errinfo = Qnil;
 	rb_set_safe_level_force(0);
 	ruby_init_stack(&errs[STACK_UPPER(errs, 0, 1)]);
 

test/ruby/test_beginendblock.rb

@@ -154,4 +154,26 @@ class TestBeginEndBlock < Test::Unit::TestCase
       end
     end;
   end
+
+  if defined?(fork)
+    def test_internal_errinfo_at_exit
+      # TODO: use other than break-in-fork to throw an internal
+      # error info.
+      error, pid, status = IO.pipe do |r, w|
+        pid = fork do
+          r.close
+          STDERR.reopen(w)
+          at_exit do
+            $!.class
+          end
+          break
+        end
+        w.close
+        [r.read, *Process.wait2(pid)]
+      end
+      assert_not_predicate(status, :success?)
+      assert_not_predicate(status, :signaled?)
+      assert_match(/unexpected break/, error)
+    end
+  end
 end