e78f2e2ac5
For bootstrapping purposes, this commit does not remove all uses of
the keyword "pure" -- doing so would cause the compiler to no longer
bootstrap due to some syntax extensions ("deriving" in particular).
Instead, it makes the compiler ignore "pure". Post-snapshot, we can
remove "pure" from the language.
There are quite a few (~100) borrow check errors that were essentially
all the result of mutable fields or partial borrows of `@mut`. Per
discussions with Niko I think we want to allow partial borrows of
`@mut` but detect obvious footguns. We should also improve the error
message when `@mut` is erroneously reborrowed.
36 lines
1.1 KiB
Rust
36 lines
1.1 KiB
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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trait Mumbo {
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fn jumbo(&self, x: @uint) -> uint;
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fn jambo(&self, x: @const uint) -> uint;
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fn jbmbo(&self) -> @uint;
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}
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impl Mumbo for uint {
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// Cannot have a larger effect than the trait:
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unsafe fn jumbo(&self, x: @uint) { *self + *x; }
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//~^ ERROR expected impure fn but found unsafe fn
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// Cannot accept a narrower range of parameters:
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fn jambo(&self, x: @uint) { *self + *x; }
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//~^ ERROR values differ in mutability
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// Cannot return a wider range of values:
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fn jbmbo(&self) -> @const uint { @const 0 }
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//~^ ERROR values differ in mutability
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}
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fn main() {}
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