Add Knuth's man-or-boy test

1 files changed, 2 insertions, 0 deletions

diff --git a/ast.c b/ast.c
index 66ca4a1..55e21f0 100644
--- a/ast.c
+++ b/ast.c
@@ -23,6 +23,8 @@ ast_new (ast_type_t type)
     ast_t *ast = g_new0 (ast_t, 1);
     ast->type = type;
     ast->common.children = g_queue_new ();
+    ast->common.predecessors = g_queue_new ();
+    ast->common.successors = g_queue_new ();
     return ast;
 }