test_jit.rb: change format of test error output

to avoid breaking redmine quote like
https://bugs.ruby-lang.org/issues/15522

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66781 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/test/lib/jit_support.rb b/test/lib/jit_support.rb
index 3877c6ec7e..c1624cc3b2 100644
--- a/test/lib/jit_support.rb
+++ b/test/lib/jit_support.rb
@@ -57,7 +57,7 @@ module JITSupport
   end
 
   def code_block(code)
-    "```\n#{code}\n```\n\n"
+    %Q["""\n#{code}\n"""\n\n]
   end
 
   # We're retrying cc1 not found error on gcc, which should be solved in the future but ignored for now.