ri completion throws warning under ruby 2.6.3

[graywolf]

When I write in terminal

ri mktmpd<TAB>

the output is as follows

$ ri mktmpd-e:1: warning: flip-flop is deprecated
Nothing known about RSS::Maker::RSS09::Channel
Did you mean?  RSS::Maker::RSS09::Channel
               RSS::Maker::RSS092::Channel
               RSS::Maker::RSS091::Channel
               RSS::Maker::RSS20::Channel
               RSS::Maker::RSS10::Channel
               RSS::Maker::RSS09::Channel::Title
               RSS::Maker::RSS09::Channel::Links
               RSS::Maker::RSS09::Channel::Cloud
               RSS::Maker::RSS09::Image
               RSS::Maker::RSS092::Image
               RSS::Maker::RSS091::Image
               RSS::Maker::RSS20::Image
               RSS::Maker::RSS10::Image
               RSS::Maker::RSS09::Items
ir ^C

Ruby version string

$ ruby --version
ruby 2.6.3p62 (2019-04-16 revision 67580) [x86_64-linux]

Environment is up-to-date archlinux.

[graywolf]

The Nothing known about... can be fixed by

+   $ git diff
diff --git a/ri b/ri
index 8f33141..275dfa6 100644
--- a/ri
+++ b/ri
@@ -23,7 +23,7 @@ _ri_get_methods()
         # older versions of ri didn't distinguish between class/module and
         # instance methods
         COMPREPLY+=( \
-            "$(ruby -W0 $ri_path "${classes[@]}" | ruby -ane \
+            "$(ruby -W0 $ri_path "${classes[@]}" 2> /dev/null | ruby -ane \
             'if /^-/.../^-/ and ! /^-/ and ! /^ +(class|module): / then \
             print $_.split(/, |,$| +/).grep(/^[^\[]*$/).join("\n"); \
             end' | sort -u)" )

but not sure how clean that is :/

[graywolf-at-work]

Ruby 2.6.4 should fix the warning ( ruby/ruby@aae25dd ), that leaves the Nothing known about... part.