33 lines
1.0 KiB
Rust
33 lines
1.0 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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// Check that pure functions cannot modify aliased state.
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pure fn modify_in_ref(&&sum: {mut f: int}) {
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sum.f = 3; //~ ERROR assigning to mutable field prohibited in pure context
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}
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pure fn modify_in_box(sum: @mut {f: int}) {
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sum.f = 3; //~ ERROR assigning to mutable field prohibited in pure context
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}
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trait modify_in_box_rec {
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pure fn modify_in_box_rec(sum: @{mut f: int});
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}
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impl modify_in_box_rec for int {
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pure fn modify_in_box_rec(sum: @{mut f: int}) {
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sum.f = self; //~ ERROR assigning to mutable field prohibited in pure context
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}
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}
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fn main() {
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}
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