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