From 2c11ccb861e86bcb42ee80d297a16c4402347178 Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Wed, 11 Dec 2013 01:48:17 +0000
Subject: envutil.rb: backtrace may not be present

* test/ruby/envutil.rb (assert_separately): SystemStackError at
  machine stack overflow on platforms where sigaltstack is
  unavailable does not have backtrace.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44130 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 test/ruby/envutil.rb | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/test/ruby/envutil.rb b/test/ruby/envutil.rb
index 6409872ba4..93f054724f 100644
--- a/test/ruby/envutil.rb
+++ b/test/ruby/envutil.rb
@@ -345,8 +345,10 @@ eom
           ignore_stderr = nil
         end
         if res
-          res.backtrace.each do |l|
-            l.sub!(/\A-:(\d+)/){"#{file}:#{line + $1.to_i}"}
+          if bt = res.backtrace
+            bt.each do |l|
+              l.sub!(/\A-:(\d+)/){"#{file}:#{line + $1.to_i}"}
+            end
           end
           raise res
         end
-- 
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