111 lines
3.2 KiB
Rust
111 lines
3.2 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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// Note: the borrowck analysis is currently flow-insensitive.
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// Therefore, some of these errors are marked as spurious and could be
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// corrected by a simple change to the analysis. The others are
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// either genuine or would require more advanced changes. The latter
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// cases are noted.
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fn borrow(_v: &int) {}
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fn inc(v: &mut ~int) {
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*v = ~(**v + 1);
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}
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fn post_aliased_const() {
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let mut v = ~3;
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borrow(v);
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let _w = &const v;
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}
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fn post_aliased_mut() {
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// SPURIOUS--flow
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let mut v = ~3;
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borrow(v); //~ ERROR loan of mutable local variable as immutable conflicts with prior loan
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let _w = &mut v; //~ NOTE prior loan as mutable granted here
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}
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fn post_aliased_scope(cond: bool) {
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let mut v = ~3;
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borrow(v);
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if cond { inc(&mut v); }
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}
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fn loop_overarching_alias_mut() {
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let mut v = ~3;
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let mut _x = &mut v; //~ NOTE prior loan as mutable granted here
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loop {
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borrow(v); //~ ERROR loan of mutable local variable as immutable conflicts with prior loan
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}
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}
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fn block_overarching_alias_mut() {
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let mut v = ~3;
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let mut _x = &mut v; //~ NOTE prior loan as mutable granted here
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for 3.times {
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borrow(v); //~ ERROR loan of mutable local variable as immutable conflicts with prior loan
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}
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}
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fn loop_aliased_mut() {
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let mut v = ~3, w = ~4;
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let mut _x = &mut w;
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loop {
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borrow(v); //~ ERROR loan of mutable local variable as immutable conflicts with prior loan
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_x = &mut v; //~ NOTE prior loan as mutable granted here
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}
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}
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fn while_aliased_mut(cond: bool) {
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let mut v = ~3, w = ~4;
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let mut _x = &mut w;
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while cond {
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borrow(v); //~ ERROR loan of mutable local variable as immutable conflicts with prior loan
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_x = &mut v; //~ NOTE prior loan as mutable granted here
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}
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}
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fn while_aliased_mut_cond(cond: bool, cond2: bool) {
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let mut v = ~3, w = ~4;
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let mut _x = &mut w;
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while cond {
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borrow(v); //~ ERROR loan of mutable local variable as immutable conflicts with prior loan
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if cond2 {
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_x = &mut v; //~ NOTE prior loan as mutable granted here
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}
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}
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}
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fn loop_in_block() {
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let mut v = ~3, w = ~4;
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let mut _x = &mut w;
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for uint::range(0u, 10u) |_i| {
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borrow(v); //~ ERROR loan of mutable local variable as immutable conflicts with prior loan
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_x = &mut v; //~ NOTE prior loan as mutable granted here
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}
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}
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fn at_most_once_block() {
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fn at_most_once(f: fn()) { f() }
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// Here, the borrow check has no way of knowing that the block is
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// executed at most once.
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let mut v = ~3, w = ~4;
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let mut _x = &mut w;
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do at_most_once {
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borrow(v); //~ ERROR loan of mutable local variable as immutable conflicts with prior loan
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_x = &mut v; //~ NOTE prior loan as mutable granted here
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}
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}
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fn main() {}
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