+- \\ in high-level macro arguments
+ Currently, \\ is expanded in two situations:
+ 1) macro and string definition (roff.c setstrn())
+ 2) macro argument parsing (mandoc.c mandoc_getarg())
+ For user defined macros, the second happens in time because of ROFF_REPARSE.
+ But for standard high-level macros, it only happens after entering the
+ high level parsers, which is too late because the code doesn't get
+ back to roff.c roff_res() from that point. Because this requires
+ distinguishing requests, user-defined macros and standard macros
+ on the roff_res() level, it is hard to solve without the parser reorg.
+ Found by naddy@ in devel/cutils cobfusc(1) Mon, 16 Feb 2015 19:10:52 +0100
+ loc *** exist *** algo *** size ** imp *
+