Ruby

merge revision(s) 110f242ef9b495037f59e4972ee102a8b8b372d5: [Backport #17861]

    Also `\U` after control/meta is invalid [Bug #17861]

    As well as `\u`, `\U` should be invalid there too.
    And highlight including `u`/`U` not only the backslash before it.
    ---
     parse.y                 | 12 ++++++++++--
     test/ruby/test_parse.rb | 15 +++++++++++++++
     2 files changed, 25 insertions(+), 2 deletions(-)