40 lines
1.4 KiB
Rust
40 lines
1.4 KiB
Rust
// Copyright 2014 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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use std::iter::{Range,range};
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trait Itble<'r, T, I: Iterator<Item=T>> { fn iter(&'r self) -> I; }
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impl<'r> Itble<'r, uint, Range<uint>> for (uint, uint) {
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fn iter(&'r self) -> Range<uint> {
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let &(min, max) = self;
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range(min, max)
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}
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}
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fn check<'r, I: Iterator<Item=uint>, T: Itble<'r, uint, I>>(cont: &T) -> bool
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//~^ HELP as shown: fn check<'r, I: Iterator<Item = uint>, T: Itble<'r, uint, I>>(cont: &'r T)
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{
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let cont_iter = cont.iter();
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//~^ ERROR cannot infer an appropriate lifetime for autoref due to conflicting requirements
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let result = cont_iter.fold(Some(0u16), |state, val| {
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state.map_or(None, |mask| {
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let bit = 1 << val;
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if mask & bit == 0 {Some(mask|bit)} else {None}
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})
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});
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result.is_some()
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}
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fn main() {
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check((3u, 5u));
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//~^ ERROR mismatched types: expected `&_`, found `(uint, uint)` (expected &-ptr, found tuple)
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}
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