On 25 Nov 2006, at 03:00, Joel E. Denny wrote:
You would need a rule telling, in the case of multiple
occurrences, when the
default names can be used.
I addressed the problem of ambiguous names here:
http://lists.gnu.org/archive/html/bison-patches/2006-11/
msg00039.html
If you split up the problem of naming variables - language feature,
from the unused variables - a compiler option, then it might simplify
implementation. For example, one might write
exp : exp '+' exp { $$ = $1; }
%unused @2, $3
;
if now the location value of variable 2 and semantic value of
variable 3 are unused.
Then one is freed from restraints of the grammar language itself.
Hans Aberg
