type t = | Blk_tuple| Blk_array| Blk_poly_var| Blk_record of string array| Blk_module of string list| Blk_extension| Blk_na of string| Blk_record_ext of string array| Blk_record_inlined of {name : string;num_nonconst : int;fields : string array;
}| Blk_constructor of {name : string;num_nonconst : int;
}| Blk_class| Blk_module_export