Since commit 281235491e0eef7be051126b2c99109c4f5332be, there are warnings in blead when a malformed UTF-8 character is tested for being an alpha, punct etc. The warning message is like: It is deprecated to pass malformed UTF-8 to character classification macros, for "_Perl_IDStart" at op/ref.t line 506. (I'm open to better wording suggestions) There are several test files that now generate these messages. I suspect that they are the result of bugs being unmasked by this new warning. I will not be able to look at them until after the visible code changes freeze in late February. Below is a list of the test files in case someone who has particular expertise in any of them wishes to investigate sooner than I can. t/op/ref.t t/uni/package.t ext/XS-APItest/t/svpv_magic.tThread Next