40 lines
1.2 KiB
Rust
40 lines
1.2 KiB
Rust
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// 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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// Various unsuccessful attempts to put the unboxed closure kind
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// inference into an awkward position that might require fixed point
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// iteration (basically where inferring the kind of a closure `c`
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// would require knowing the kind of `c`). I currently believe this is
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// impossible.
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fn a() {
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let mut closure0 = None;
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let vec = vec!(1, 2, 3);
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loop {
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{
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let closure1 = || {
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match closure0.take() {
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Some(c) => {
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return c();
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//~^ ERROR the type of this value must be known in this context
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}
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None => { }
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}
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};
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closure1();
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}
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closure0 = || vec;
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}
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}
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fn main() { }
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