* match.c (match_line): Logic restructured to allow for

regex variables which also have nested variables.
Previously this code was assuming that the cases were
mutually exclusive, and the parser happened to work that way.
Also, added support for a "double var" match which occurs
when an unbound variable is followed by a regex variable.
This case should be allowed because it makes sense.
It's similar to a variable followed by a regex, except
that the regex is also a variable binding.

* parser.y (o_elems_transform): New function.
(o_elems_opt, o_elems_opt2, quasilit): Transform o_elems with new
function. This is needed because subst_vars doesn't
deal with the nested var syntax for consecutive variables.
(var): New syntax case '{' IDENT exprs '}' elem. This
allows consecutive variables to be nested in all cases.

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