Remove useless regression tests; ref #4306

test/t/array.rb

@@ -392,10 +392,3 @@ assert('Array#freeze') do
     a[0] = 1
   end
 end
-
-assert('shared array replace') do
-  a = [0] * 40
-  b = [0, 1, 2]
-  b.replace a[1, 20].dup
-  assert_equal 20, b.size
-end