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The attached patch ports the implementation of keyword-only arguments
from revision 52491 back to trunk.
This is the first time I've worked on the C internals, so here are some
notes:
- test_collections is the only test which fails, because it tries to
call a function with more than 255 arguments, which results in a
SyntaxError because of the following added code in Python/ast.c. What
should be done about it?
 if (nposargs + nkwonlyargs > 255) {
 ast_error(n, "more than 255 arguments");
 return NULL;
 }
- The patch only adds what's in revision 52491. There is at least one
more change involving keyword-only arguments, for example issue1573. Are
there others? Should they be included in this patch or in a separate one?
- There are some changes which were generated, like Python/Python-ast.c
(which needs to be checked in separately).
- Is there documentation which needs to be updated?