Hello, everyone!
I found a very strange thing in the ngx_rbtree_delete function. It seems
that there is redundant assignment under the following if statement:
if (subst->parent == node) {
temp->parent = subst;
Could someone please explain to me why this assignment is needed if temp
was taken as subst->right before? Because it was a child of subst, it means
temp had subst as its parent.
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