On Tue, Nov 21, 2023 at 09:27:12AM +0000, Dan Dart wrote:
That does sound like a bug. but it doesn't seem patchable using {-# LANGUAGE CPP #-} because it *is* a bug in -XCPP... :p
Have you reported it anywhere?
Not yet reported outside this thread. Sure, morally speaking, this is a bug in "-XCPP", but in practice "-XCPP" unavoidably uses the actual C preprocessor, and is subject to its syntax idiosyncrasies. There's not a lot GHC can do once CPP joins the split lines and drops the trailing "\", and the documented trailing whitespace work-around no longer (if it once did) helps. So the only options appear to be to live with editing the code to to use a trailing "\ \" instead of just "\" when enablng -XCPP (and reverting when dropping "-XCPP", or else introduce a new syntax for multi-part string literals. Unless someone can suggest a better idea... -- Viktor.