diff options
Diffstat (limited to 'src/test/ui/borrowck/borrowck-loan-rcvr-overloaded-op.rs')
-rw-r--r-- | src/test/ui/borrowck/borrowck-loan-rcvr-overloaded-op.rs | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/src/test/ui/borrowck/borrowck-loan-rcvr-overloaded-op.rs b/src/test/ui/borrowck/borrowck-loan-rcvr-overloaded-op.rs new file mode 100644 index 000000000..4da10fd44 --- /dev/null +++ b/src/test/ui/borrowck/borrowck-loan-rcvr-overloaded-op.rs @@ -0,0 +1,46 @@ +use std::ops::Add; + +#[derive(Copy, Clone)] +struct Point { + x: isize, + y: isize, +} + +impl Add<isize> for Point { + type Output = isize; + + fn add(self, z: isize) -> isize { + self.x + self.y + z + } +} + +impl Point { + pub fn times(&self, z: isize) -> isize { + self.x * self.y * z + } +} + +fn a() { + let mut p = Point {x: 3, y: 4}; + + // ok (we can loan out rcvr) + p + 3; + p.times(3); +} + +fn b() { + let mut p = Point {x: 3, y: 4}; + + // Here I create an outstanding loan and check that we get conflicts: + + let q = &mut p; + + p + 3; //~ ERROR cannot use `p` + p.times(3); //~ ERROR cannot borrow `p` + + *q + 3; // OK to use the new alias `q` + q.x += 1; // and OK to mutate it +} + +fn main() { +} |