type op
  = OpAdd
  | OpSub
  | OpMul
  | OpDiv
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type lit
  = LitInt of int
  | LitNegInt of int
  | LitFloat of float
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type ty
  = TySizedInt
  | TyGenericInt
  | TyFunc of ty list * ty
  | TyPointer of ty
  | TyStruct of (string * ty) list
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type expr
  = ExprUnit
  | ExprLit of lit
  | ExprBin of expr * op * expr
  | ExprAnnot of expr * ty
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type pat
  = PatName of string
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type stmt
  = StmtLet of pat * expr
  | StmtReturn of expr
[@@deriving show]

type block =
  { stmts : stmt list
  ; ret : expr
  }
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type func =
  { name : string
  ; body : block
  }
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type decl
  = DeclFunc of func
[@@deriving show]

type program = decl list
[@@deriving show]