sig val meta_loc_patt : Camlp4.Sig.Camlp4Ast.loc -> 'a -> Camlp4.Sig.Camlp4Ast.patt val meta_loc_expr : Camlp4.Sig.Camlp4Ast.loc -> 'a -> Camlp4.Sig.Camlp4Ast.expr end