From fdcc9c9e43ea8e67479e604a741b8fad09239ec8 Mon Sep 17 00:00:00 2001
From: naruse <naruse@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Mon, 5 Nov 2018 23:06:50 +0000
Subject: [PATCH] Don't set throw data as cause [Bug #15282]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65554 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 eval.c                      | 2 +-
 test/ruby/test_exception.rb | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/eval.c b/eval.c
index 35255e0975..5900f22dbd 100644
--- a/eval.c
+++ b/eval.c
@@ -531,7 +531,7 @@ setup_exception(rb_execution_context_t *ec, int tag, volatile VALUE mesg, VALUE
 		    mesg = rb_obj_dup(mesg);
 		}
 	    }
-	    if (cause != Qundef) {
+	    if (cause != Qundef && !THROW_DATA_P(cause)) {
 		exc_setup_cause(mesg, cause);
 	    }
 	    if (NIL_P(bt)) {
diff --git a/test/ruby/test_exception.rb b/test/ruby/test_exception.rb
index 8784dd7dd7..88b02293e8 100644
--- a/test/ruby/test_exception.rb
+++ b/test/ruby/test_exception.rb
@@ -699,6 +699,12 @@ end.join
     assert_same(a, e.cause.cause)
   end
 
+  def test_cause_at_end
+    assert_in_out_err([], <<-'end;', [], [/-: unexpected return\n/, /.*undefined local variable or method `n'.*\n/])
+      END{n}; END{return}
+    end;
+  end
+
   def test_raise_with_cause
     msg = "[Feature #8257]"
     cause = ArgumentError.new("foobar")