...... removed in latest revision

[mflatt]

I've pushed a change to remove ...... from the pattern and template language. In its place, there's a rule about how a ... match is represented when it is used to form a tail pattern.

The representation takes advantage of the previous change to support syntax-object groups and group sequences. The end result is that ... works just as you'd expect in patterns and templates, but a little care may be necessary in writing the pattern if you want to treat the match value as a plain list. Even the list issue should mostly go away as we introduce and encourage generic stream operations instead of cons-list-specific operations.