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| From mathcomp Require Import all_ssreflect. | |
| Inductive tree := branch : seq tree -> tree. | |
| Fixpoint size (t : tree) := | |
| let: branch ts := t in | |
| (fix size_rec ts := | |
| if ts is t :: ts then | |
| size t + size_rec ts | |
| else 1) ts. | |
| Fixpoint size' (t : tree) := | |
| let: branch ts := t in | |
| foldl (fun n t => n + size' t) 1 ts. |
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