https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67224
--- Comment #4 from Manuel López-Ibáñez <manu at gcc dot gnu.org> --- I cannot say anything about the correctness of the patch, but I would expect such a patch to contain many testcases (at least similar to those that test for UCNs see https://gcc.gnu.org/ml/gcc-patches/2014-11/msg00337.html), patches need to be bootstrapped & regression tested and submitted to gcc-patches with a Changelog (https://gcc.gnu.org/wiki/GettingStarted#Basics:_Contributing_to_GCC_in_10_easy_steps). Please CC Joseph Myers when you submit.
