diff --git a/src/runtime/c/pgf/linearize.c b/src/runtime/c/pgf/linearize.c
index ce1b99b5b..56634d9b1 100644
--- a/src/runtime/c/pgf/linearize.c
+++ b/src/runtime/c/pgf/linearize.c
@@ -206,20 +206,6 @@ pgf_lzr_index(PgfLzr* lzr, PgfCCat* cat, PgfProduction prod)
 	}
 }
 
-static void
-pgf_lzr_index_ccat(PgfLzr* lzr, PgfCCat* cat)
-{
-	gu_debug("ccat: %d", cat->fid);
-	if (gu_seq_is_null(cat->prods)) {
-		return;
-	}
-	size_t n_prods = gu_seq_length(cat->prods);
-	for (size_t i = 0; i < n_prods; i++) {
-		PgfProduction prod = gu_seq_get(cat->prods, PgfProduction, i);
-		pgf_lzr_index(lzr, cat, prod);
-	}
-}
-
 typedef struct {
 	GuMapItor fn;
 	PgfLzr* lzr;
@@ -229,19 +215,18 @@ static void
 pgf_lzr_index_cnccat_cb(GuMapItor* fn, const void* key, void* value,
 			GuExn* err)
 {
-	(void) (key && err);
 	PgfLzrIndexFn* clo = (PgfLzrIndexFn*) fn;
-	PgfCncCat** cnccatp = value;
-	PgfCncCat* cnccat = *cnccatp;
-	gu_enter("-> cnccat: %s", cnccat->cid);
-	int n_ccats = gu_list_length(cnccat->cats);
-	for (int i = 0; i < n_ccats; i++) {
-		PgfCCat* cat = gu_list_index(cnccat->cats, i);
-		if (cat) {
-			pgf_lzr_index_ccat(clo->lzr, cat);
-		}
+    PgfCCat *ccat = *((PgfCCat **) value);
+     
+   	gu_debug("ccat: %d", ccat->fid);
+	if (gu_seq_is_null(ccat->prods)) {
+		return;
+	}
+	size_t n_prods = gu_seq_length(ccat->prods);
+	for (size_t i = 0; i < n_prods; i++) {
+		PgfProduction prod = gu_seq_get(ccat->prods, PgfProduction, i);
+		pgf_lzr_index(clo->lzr, ccat, prod);
 	}
-	gu_exit("<-");
 }
 
 
@@ -254,12 +239,7 @@ pgf_new_lzr(PgfConcr* cnc, GuPool* pool)
 	lzr->fun_indices = gu_map_type_new(PgfFunIndices, pool);
 	lzr->coerce_idx = gu_map_type_new(PgfCoerceIdx, pool);
 	PgfLzrIndexFn clo = { { pgf_lzr_index_cnccat_cb }, lzr };
-	gu_map_iter(cnc->cnccats, &clo.fn, NULL);
-	size_t n_extras = gu_seq_length(cnc->extra_ccats);
-	for (size_t i = 0; i < n_extras; i++) {
-		PgfCCat* cat = gu_seq_get(cnc->extra_ccats, PgfCCat*, i);
-		pgf_lzr_index_ccat(lzr, cat);
-	}
+	gu_map_iter(cnc->ccats, &clo.fn, NULL);
 	// TODO: prune productions with zero linearizations
 	return lzr;
 }
diff --git a/src/runtime/c/pgf/reader.c b/src/runtime/c/pgf/reader.c
index 7be6f04ee..be9e33d80 100644
--- a/src/runtime/c/pgf/reader.c
+++ b/src/runtime/c/pgf/reader.c
@@ -597,13 +597,8 @@ static GU_DEFINE_TYPE(PgfCCatMap, GuIntMap, gu_ptr_type(PgfCCat),
 static GU_DEFINE_TYPE(PgfCncCatMap, GuStringMap, gu_ptr_type(PgfCncCat),
 		      &gu_null_struct);
 
-typedef struct {
-	GuMapItor fn;
-	GuBuf* seq;
-} PgfCCatCbCtx;
-
 static PgfCncCat*
-pgf_ccat_set_cnccat(PgfCCat* ccat, GuBuf* newly_set)
+pgf_ccat_set_cnccat(PgfCCat* ccat)
 {
 	if (!ccat->cnccat) {
 		size_t n_prods = gu_seq_length(ccat->prods);
@@ -615,8 +610,7 @@ pgf_ccat_set_cnccat(PgfCCat* ccat, GuBuf* newly_set)
 			case PGF_PRODUCTION_COERCE: {
 				PgfProductionCoerce* pcoerce = i.data;
 				PgfCncCat* cnccat = 
-					pgf_ccat_set_cnccat(pcoerce->coerce,
-							    newly_set);
+					pgf_ccat_set_cnccat(pcoerce->coerce);
 				if (!ccat->cnccat) {
 					ccat->cnccat = cnccat;
 				} else if (ccat->cnccat != cnccat) {
@@ -634,7 +628,6 @@ pgf_ccat_set_cnccat(PgfCCat* ccat, GuBuf* newly_set)
 				gu_impossible();
 			}
 		}
-		gu_buf_push(newly_set, PgfCCat*, ccat);
 	}
 	return ccat->cnccat;
 }
@@ -644,9 +637,8 @@ static void
 pgf_read_ccat_cb(GuMapItor* fn, const void* key, void* value, GuExn* err)
 {
 	(void) (key && err);
-	PgfCCatCbCtx* ctx = (PgfCCatCbCtx*) fn;
 	PgfCCat** ccatp = value;
-	pgf_ccat_set_cnccat(*ccatp, ctx->seq);
+	pgf_ccat_set_cnccat(*ccatp);
 }
 
 static void*
@@ -673,12 +665,10 @@ pgf_read_new_PgfConcr(GuType* type, PgfReader* rdr, GuPool* pool,
 	pgf_read_into_map(ccats_t, rdr, concr->ccats, rdr->opool);    
 	concr->cnccats = pgf_read_new(rdr, gu_type(PgfCncCatMap), 
 				      rdr->opool, NULL);
-
-	GuBuf* extra_ccats = gu_new_buf(PgfCCat*, pool);
-	PgfCCatCbCtx ctx = { { pgf_read_ccat_cb }, extra_ccats };
-	gu_map_iter(concr->ccats, &ctx.fn, NULL);
-	concr->extra_ccats = gu_buf_freeze(extra_ccats, rdr->opool);
 	concr->max_fid = pgf_read_int(rdr);
+
+	GuMapItor fn = { pgf_read_ccat_cb };
+	gu_map_iter(concr->ccats, &fn, NULL);
 	return concr;
 }