diff --git a/bootstraptest/test_knownbug.rb b/bootstraptest/test_knownbug.rb
index 069f09e41f..6aa4c714e2 100644
--- a/bootstraptest/test_knownbug.rb
+++ b/bootstraptest/test_knownbug.rb
@@ -5,5 +5,6 @@
 
 # massign
 assert_equal '2', 'a, a = 1, 2; a', "[ruby-dev:31522]"
+assert_equal '[0,1,{2=>3}]', '[0,*[1],2=>3]', "[ruby-dev:31592]"