45 lines
1.3 KiB
Rust
45 lines
1.3 KiB
Rust
// Copyright 2012-2015 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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//~^^^^^^^^^^ ERROR overflow
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//
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// We get an error message at the top of file (dummy span).
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// This is not helpful, but also kind of annoying to prevent,
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// so for now just live with it.
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// This test case was originally for issue #2258.
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trait ToOpt: Sized {
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fn to_option(&self) -> Option<Self>;
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}
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impl ToOpt for usize {
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fn to_option(&self) -> Option<usize> {
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Some(*self)
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}
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}
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impl<T:Clone> ToOpt for Option<T> {
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fn to_option(&self) -> Option<Option<T>> {
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Some((*self).clone())
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}
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}
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fn function<T:ToOpt + Clone>(counter: usize, t: T) {
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if counter > 0 {
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function(counter - 1, t.to_option());
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// FIXME(#4287) Error message should be here. It should be
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// a type error to instantiate `test` at a type other than T.
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}
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}
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fn main() {
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function(22, 22);
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}
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