let range = AST.IndexConstraint [AST.ToRange (AST.PrimLit "0") (AST.PrimLit "16")]
let ty_def = AST.TDA $ AST.ConsArrayDef range std_logic_ty
let ty_dec = AST.TypeDec ty_id ty_def
let range = AST.IndexConstraint [AST.ToRange (AST.PrimLit "0") (AST.PrimLit "16")]
let ty_def = AST.TDA $ AST.ConsArrayDef range std_logic_ty
let ty_dec = AST.TypeDec ty_id ty_def