revert r57222 because of SEGV

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_2@57226 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 0 insertions, 3 deletions

diff --git a/eval.c b/eval.c
index a8935ff7ce..fbd28565ed 100644
--- a/eval.c
+++ b/eval.c
@@ -468,9 +468,6 @@ exc_setup_cause(VALUE exc, VALUE cause)
 #endif
     if (!NIL_P(cause) && cause != exc) {
 	rb_ivar_set(exc, id_cause, cause);
-	if (!rb_ivar_defined(cause, id_cause)) {
-	    rb_ivar_set(cause, id_cause, Qnil);
-	}
     }
     return exc;
 }