[Bug #19016] re-order error handling at cleanup

Build and store the error message with `#detailed_message` before
terminating all Ractors, then show the message later.

1 files changed, 8 insertions, 7 deletions

diff --git a/test/ruby/test_exception.rb b/test/ruby/test_exception.rb
index 3a2aeeab80..1d3ff6ac18 100644
--- a/test/ruby/test_exception.rb
+++ b/test/ruby/test_exception.rb
@@ -1459,19 +1459,20 @@ $stderr = $stdout; raise "\x82\xa0"') do |outs, errs, status|
   end
 
   def test_syntax_error_detailed_message
-    Tempfile.create(%w[detail .rb]) do |lib|
-      lib.print "#{<<~"begin;"}\n#{<<~'end;'}"
+    Dir.mktmpdir do |dir|
+      File.write(File.join(dir, "detail.rb"), "#{<<~"begin;"}\n#{<<~'end;'}")
       begin;
         class SyntaxError
           def detailed_message(**)
-            Thread.start {}.join
-            "#{super}\n""<#{File.basename(__FILE__)}>"
+            Thread.new {}.join
+            "<#{super}>\n""<#{File.basename(__FILE__)}>"
+          rescue ThreadError => e
+            e.message
           end
         end
       end;
-      lib.close
-      pattern = /^<#{Regexp.quote(File.basename(lib.path))}>/
-      assert_in_out_err(%W[-r#{lib.path} -], "1+", [], pattern)
+      pattern = /^<detail\.rb>/
+      assert_in_out_err(%W[-r#{dir}/detail -], "1+", [], pattern)
     end
   end
 end