now the robust parser is purely top-down and the meta rules compete on a fair basis with the grammar rules

src/runtime/c/pgf/data.c

@@ -3,6 +3,7 @@
 #include <gu/type.h>
 #include <gu/variant.h>
 #include <gu/assert.h>
+#include <math.h>
 
 bool 
 pgf_tokens_equal(PgfTokens t1, PgfTokens t2)
@@ -184,6 +185,12 @@ GU_DEFINE_TYPE(
 	GU_MEMBER(PgfCatFun, prob, double),
 	GU_MEMBER(PgfCatFun, fun, PgfCId));
 
+static float inf_float = INFINITY;
+
+GU_DEFINE_TYPE(PgfMetaChildMap, GuMap,
+		       gu_type(PgfCat), NULL,
+		       gu_type(float), &inf_float);
+
 GU_DEFINE_TYPE(
 	PgfCat, struct, 
 	GU_MEMBER(PgfCat, context, PgfHypos),