/usr/share/doc/frown-doc/examples/other/Empty.g is in frown-doc 0.6.2.3-4.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | {-
A grammar with an `empty' nonterminal (that is, a nonterminal that
denotes the empty language).
frown Empty.g
-}
module Empty
where
type Terminal = Char
type Result = Maybe
%{
Nonterminal = s;
}%
frown ts = fail "syntax error"
|