envutil.rb: env hash

* test/ruby/envutil.rb (assert_separately): keep environment hash
  first if exists.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40331 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/ruby/envutil.rb

@@ -292,7 +292,7 @@ module Test
   end
 eom
         args = args.dup
-        $:.each{|l| args.unshift "-I#{l}" }
+        args.insert((Hash === args.first ? 1 : 0), *$:.map {|l| "-I#{l}"})
         ignore_stderr = opt.delete(:ignore_stderr)
         stdout, stderr, status = EnvUtil.invoke_ruby(args, src, true, true, opt)
         abort = status.coredump? || (status.signaled? && ABORT_SIGNALS.include?(status.termsig))