[perl #61204] :x() in .subst does not fail when there aren't enough matches

[jn...@jnthn.net via RT]

On Tue Dec 09 02:00:40 2008, masak wrote:
> Rakudo r33613 treats the :x($n) adverb as "up to $n matches", not (as
> specced) "exactly $n matches".
> 
> $ perl6 -e 'say "foofoofoo".subst("foo", "bar", :x(3))' # right
> barbarbar
> 
> $ perl6 -e 'say "foofoofoo".subst("foo", "bar", :x(4))' # wrong
> barbarbar

Fixed (plus for the regex case) in git 01811bf. Note the spec says it
hands back the original string rather than any kind of more epic fail,
so far as I can tell. Unfudged a couple of tests in subst.t too.

Thanks,

Jonathan