Ruby » Ruby master

• array.c (rb_ary_permutation, rb_ary_repeated_permutation, rb_ary_repeated_combination, rb_ary_product): use ary_make_shared_copy instead of ary_make_substitution. [ruby-dev:42067] [Bug #3708]
• test/ruby/test_array.rb (test_product, test_repeated_permutation, test_repeated_combination): append assertions against [Bug #3708].

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@29044 b2dd03c8-39d4-4d8f-98ff-823fe69b080e