0eea0f6e90
The borrow checker doesn't allow constructing such a type at runtime using safe code, but there isn't any reason to ban them in the type checker. Included in this commit is an example of a neat static doubly-linked list. Feature-gated under the static_recursion gate to be on the safe side, but there are unlikely to be any reasons this shouldn't be turned on by default.
34 lines
883 B
Rust
34 lines
883 B
Rust
// Copyright 2012-2014 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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#![feature(static_recursion)]
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// test that autoderef of a type like this does not
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// cause compiler to loop. Note that no instances
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// of such a type could ever be constructed.
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struct T(Box<T>);
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trait ToStr2 {
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fn my_to_string(&self) -> String;
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}
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impl ToStr2 for T {
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fn my_to_string(&self) -> String { "t".to_string() }
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}
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#[allow(dead_code)]
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fn new_t(x: T) {
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x.my_to_string();
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}
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fn main() {
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}
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