47 lines
894 B
Rust
47 lines
894 B
Rust
// Check that Polonius borrow check works for simple cases.
|
|
// compile-flags: -Z polonius
|
|
|
|
pub fn return_ref_to_local() -> &'static i32 {
|
|
let x = 0;
|
|
&x //~ ERROR
|
|
}
|
|
|
|
pub fn use_while_mut() {
|
|
let mut x = 0;
|
|
let y = &mut x;
|
|
let z = x; //~ ERROR
|
|
let w = y;
|
|
}
|
|
|
|
pub fn use_while_mut_fr(x: &mut i32) -> &mut i32 {
|
|
let y = &mut *x;
|
|
let z = x; //~ ERROR
|
|
y
|
|
}
|
|
|
|
// Cases like this are why we have Polonius.
|
|
pub fn position_dependent_outlives(x: &mut i32, cond: bool) -> &mut i32 {
|
|
let y = &mut *x;
|
|
if cond {
|
|
return y;
|
|
} else {
|
|
*x = 0;
|
|
return x;
|
|
}
|
|
}
|
|
|
|
fn foo<'a, 'b>(p: &'b &'a mut usize) -> &'b usize {
|
|
p
|
|
}
|
|
|
|
// Check that we create constraints for well-formedness of function arguments
|
|
fn well_formed_function_inputs() {
|
|
let s = &mut 1;
|
|
let r = &mut *s;
|
|
let tmp = foo(&r);
|
|
s; //~ ERROR
|
|
tmp;
|
|
}
|
|
|
|
fn main() {}
|