Getting first set for nonterminals?

[remexre]

If I wanted to have Copper send Silver back the first set for every nonterminal, what would be the place to start? I want this for melt-umn/silver#205, so nonterminals can be included in "alias groups."

[schwerdf]

Copper does not make that information obtainable through the API, since that would seriously hamstring the possibility of developing alternative parser compilation pipelines.

Currently, if run at the VERY_VERBOSE or -vv level, Copper logs context sets for all the symbols in a grammar. I think it would also be possible to include the context sets in the XML-format dump, if that would help.