Nice bit of analysis!
I am just learning new syntaxes and so, this isn't a true production down situation to report as a OSS message. Moreover, do ABAP syntax check errors also get reported in the same way as functionality bugs?
If you look in support.sap.com/notes, you'll see plenty of notes for ABAP tools, like SLIN (I know, because it dumps when there's a VALUE #( blah ) statement on my 7.4 instance!). None of these cover "production down" situations either. When you create a support request, there's no such requirement either. You're reporting an issue with the product.
I suggest you create a support message with a low priority and your analysis. Then they'll either fix it (a kernel fix) or Horst will update the documentation!