ce58d965ef
Make the match exhaustive, adding handling for anonymous types and tuple coercions on the way. Also, exit early when type errors are detected, to avoid error cascades and the like.
34 lines
1,020 B
Rust
34 lines
1,020 B
Rust
// Copyright 2017 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(conservative_impl_trait)]
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use std::fmt;
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fn foo() -> Box<impl fmt::Debug+?Sized> {
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let x : Box<[u8]> = Box::new([0]);
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x
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}
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fn bar() -> Box<impl fmt::Debug+?Sized> {
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let y: Box<fmt::Debug> = Box::new([0]);
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y
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}
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fn main() {
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let f = foo();
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let b = bar();
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// this is an `*mut [u8]` in practice
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let f_raw : *mut _ = Box::into_raw(f);
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// this is an `*mut fmt::Debug` in practice
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let mut b_raw = Box::into_raw(b);
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// ... and they should not be mixable
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b_raw = f_raw as *mut _; //~ ERROR is invalid
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}
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