While trying to debug some compile time regexes (ctRegex), I used the debug conditions `std_regex_*`, and it produces some trivial errors:
- they enable usage of `writeln` while not importing `std.stdio` in all places
- `BacktrackingMatcher.ctAtomCode` is not generating a valid case when debug statements are present (needs explicit falltrough for IR.End)
- parseRegex has a typo; uses `fixupStack.data` instead of `g.fixupStack.data`
I work on a WIP patch for that all, which I will link here from my fork of phobos once I got the issue number for it.