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Assert that nodes inserted into nodelists are non-null

--- a/parse/node.c

+++ b/parse/node.c

@@ -229,6 +229,8 @@

 void nlappend(Node ***nl, size_t *len, Node *n)

 {

+    assert(n != NULL);

+

     *nl = xrealloc(*nl, (*len + 1)*sizeof(Node*));

     (*nl)[*len] = n;

     (*len)++;