diff --git a/lib/desugar.c b/lib/desugar.c
index 4596fcc..4508dc1 100644
--- a/lib/desugar.c
+++ b/lib/desugar.c
@@ -46,10 +46,8 @@ static bool deep_copy_sequence(parse_sequence_t *dst, parse_sequence_t *src)
 	if (NULL == dst->contents)
 		return false;
 
-	for (int i = 0; i < dst->count; ++i) {
-		if (!deep_copy_term(&dst->contents[i], &src->contents[i]))
-			return false;
-	}
+	for (int i = 0; i < dst->count; ++i)
+		assert(deep_copy_term(&dst->contents[i], &src->contents[i]));
 
 	return true;
 }
@@ -68,9 +66,8 @@ static bool deep_copy_term(parse_term_t *dst, parse_term_t *src)
 			return false;
 
 		for (int i = 0; i < dst->subexpr.count; ++i) {
-			if (!deep_copy_sequence(
-			        &dst->subexpr.contents[i], &src->subexpr.contents[i]))
-				return false;
+			assert(deep_copy_sequence(
+			    &dst->subexpr.contents[i], &src->subexpr.contents[i]));
 		}
 	}