expr: Make expressions variadic

Rather than only unary/binary expressions, we now support an arbitrary
number of children.  The optimizer has been re-written almost completely
and now supports optimal reordering of longer expression chains, rather
than just arm-swapping.

Fixes #85.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/ctx.c b/src/ctx.c
index a3c5140..1f3e72e 100644
--- a/src/ctx.c
+++ b/src/ctx.c
@@ -241,7 +241,7 @@ int bfs_ctx_free(struct bfs_ctx *ctx) {
 
 		free_colors(ctx->colors);
 
-		for_slist (struct bfs_expr, expr, &ctx->expr_list) {
+		for_slist (struct bfs_expr, expr, &ctx->expr_list, freelist) {
 			bfs_expr_clear(expr);
 		}
 		arena_destroy(&ctx->expr_arena);