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ocaml-hm-ctors is now a mutable list cell; user type-defs register
their constructors via ocaml-hm-register-type-def!. New
ocaml-type-of-program processes top-level decls in order:
- type-def: register ctors with the scheme inferred from PARAMS+CTORS
- def/def-rec: generalize and bind in the type env
- exception-def: no-op for typing
- expr: return inferred type
Examples:
type color = Red | Green | Blue;; Red : color
type shape = Circle of int | Square of int;;
let area s = match s with
| Circle r -> r * r
| Square s -> s * s;;
area : shape -> Int
Caveat: ctor arg types parsed as raw source strings; registry defaults
to int for any single-arg ctor. Proper type-source parsing pending.