39 lines
931 B
Rust
39 lines
931 B
Rust
// Copyright 2012 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-pattern: overly deep expansion
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// issue 2258
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trait to_opt {
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fn to_option() -> Option<Self>;
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}
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impl to_opt for uint {
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fn to_option() -> Option<uint> {
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Some(self)
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}
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}
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impl<T:Copy> to_opt for Option<T> {
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fn to_option() -> Option<Option<T>> {
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Some(self)
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}
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}
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fn function<T:to_opt>(counter: uint, t: T) {
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if counter > 0u {
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function(counter - 1u, t.to_option());
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}
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}
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fn main() {
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function(22u, 22u);
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}
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