certain useful whitespace regexps not supported

This is the regexp for a Go comment

/\*([^*]|\*+[^*/])*\*+/|//.*| |\t|\n|\r.

Currently for egg we must write it like

(/\*([^*]|\*+[^*/])*\*+/|//.*| |\t|\n|\r)+

or

(/\*([^*]|\*+[^*/])*\*+/|//.*| |\t|\n|\r)*.

But both those forms trip the rec compiler, because it seemingly does not properly handle the combination of the inner trailing .* and the outer *. rec is a bit dark art-ish and written long enough ago that I don't want to even try fixing it right now. But we can probably resolve the problem in LL1() by generating a loop in scanSep instead.

I hope the problem applies to the white space production only.

Update before posting:

white_space =
`(/\*([^*]|\*+[^*/])*\*+/| |\t|\n|\r|//\n|//[^\n]*\n|#\n|#[^\n]*\n)*` .

The monster above seems to work and do what is needed. The fix in LL1() will be however better.