Allow %prec
to define a token in the grammar.
#453
Merged
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Previously if
%prec 'x'
was the first mention of the tokenx
then cfgrammar would say "'x' isn't a token" which is clearly incorrect. This commit is maybe best thought of as a quick fix of sorts: it makes%prec 'x'
define a tokenx
if it doesn't already exist.However -- and my memory is completely fuzzy as to whether this is a Yacc compatibility thing or not -- this means that
%prec 'x'
and%prec x' (i.e. with and without quote marks) have the semantic meaning because
parse_token` treats both interchangeably. This seems consistent with other parts of the grammar even if a little odd.I believe this fixes #450.