For_testing.Nested_variantval streamable_of_variant :
Ppx_streamable__.Ctx.t ->
(Astlib.Ast_500.Parsetree.core_type * Astlib.Ast_500.Parsetree.module_expr)
Base.list ->
Astlib.Ast_500.Parsetree.module_expran variable-arity Streamable.Of_variant
module For_testing : sig ... end