test_io.rb: squiggly heredoc

* test/ruby/test_io.rb (test_threaded_flush): use squiggly here
  document to strip leading spaces.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57273 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 3 insertions, 2 deletions

diff --git a/test/ruby/test_io.rb b/test/ruby/test_io.rb
index 687c27c63d..149e471a8b 100644
--- a/test/ruby/test_io.rb
+++ b/test/ruby/test_io.rb
@@ -2527,11 +2527,12 @@ __END__
 
   def test_threaded_flush
     bug3585 = '[ruby-core:31348]'
-    src = %q{\
+    src = "#{<<~"begin;"}\n#{<<~'end;'}"
+    begin;
       t = Thread.new { sleep 3 }
       Thread.new {sleep 1; t.kill; p 'hi!'}
       t.join
-    }.gsub(/^\s+/, '')
+    end;
     10.times.map do
       Thread.start do
         assert_in_out_err([], src) {|stdout, stderr|