79 lines
2.2 KiB
Rust
79 lines
2.2 KiB
Rust
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// compile-flags:--borrowck=err
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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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// NDM--scope of &
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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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if cond { inc(&mut v); } //! NOTE prior loan as mutable granted here
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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 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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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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