| // Copyright 2016 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| // compile-flags:-Zborrowck=mir -Zverbose |
| |
| // Test that we can deduce when projections like `T::Item` outlive the |
| // function body. Test that this does not imply that `T: 'a` holds. |
| |
| #![allow(warnings)] |
| #![feature(rustc_attrs)] |
| |
| use std::cell::Cell; |
| |
| fn twice<F, T>(mut value: T, mut f: F) |
| where |
| F: FnMut(&T, Cell<&Option<T::Item>>), |
| T: Iterator, |
| { |
| let mut n = value.next(); |
| f(&value, Cell::new(&n)); |
| f(&value, Cell::new(&n)); |
| } |
| |
| #[rustc_errors] |
| fn generic1<T: Iterator>(value: T) { |
| // No error here: |
| twice(value, |value_ref, item| invoke1(item)); |
| } |
| |
| fn invoke1<'a, T>(x: Cell<&'a Option<T>>) |
| where |
| T: 'a, |
| { |
| } |
| |
| #[rustc_errors] |
| fn generic2<T: Iterator>(value: T) { |
| twice(value, |value_ref, item| invoke2(value_ref, item)); |
| //~^ ERROR the parameter type `T` may not live long enough |
| } |
| |
| fn invoke2<'a, T, U>(a: &T, b: Cell<&'a Option<U>>) |
| where |
| T: 'a, |
| { |
| } |
| |
| fn main() {} |