66 lines
1.8 KiB
Rust
66 lines
1.8 KiB
Rust
// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// run-pass
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// Regression test for issue #21245. Check that we are able to infer
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// the types in these examples correctly. It used to be that
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// insufficient type propagation caused the type of the iterator to be
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// incorrectly unified with the `*const` type to which it is coerced.
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// pretty-expanded FIXME #23616
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use std::ptr;
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trait IntoIterator {
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type Iter: Iterator;
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fn into_iter2(self) -> Self::Iter;
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}
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impl<I> IntoIterator for I where I: Iterator {
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type Iter = I;
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fn into_iter2(self) -> I {
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self
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}
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}
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fn desugared_for_loop_bad<T>(v: Vec<T>) {
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match IntoIterator::into_iter2(v.iter()) {
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mut iter => {
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loop {
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match ::std::iter::Iterator::next(&mut iter) {
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::std::option::Option::Some(x) => {
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unsafe { ptr::read(x); }
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},
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::std::option::Option::None => break
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}
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}
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}
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}
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}
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fn desugared_for_loop_good<T>(v: Vec<T>) {
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match v.iter().into_iter() {
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mut iter => {
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loop {
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match ::std::iter::Iterator::next(&mut iter) {
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::std::option::Option::Some(x) => {
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unsafe { ptr::read(x); }
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},
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::std::option::Option::None => break
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}
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}
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}
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}
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}
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fn main() {}
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