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