{"ast_node_type":"other","tokens":[{"end":107,"kind":"keyword","start":0,"text":"*"}]}
     * will find the expression `vec![1, 2, 3]` as the "most blameable" reason for this missing constraint.
     * then if you pass in `(Some(vec![1, 2, 3]), false)`, this helper `point_at_specific_expr_if_possible`
     *