| struct Point { x: isize, y: isize } |
| |
| trait Methods { |
| fn impurem(&self); |
| fn blockm<F>(&self, f: F) where F: FnOnce(); |
| } |
| |
| impl Methods for Point { |
| fn impurem(&self) { |
| } |
| |
| fn blockm<F>(&self, f: F) where F: FnOnce() { f() } |
| } |
| |
| fn a() { |
| let mut p = Point {x: 3, y: 4}; |
| |
| // Here: it's ok to call even though receiver is mutable, because we |
| // can loan it out. |
| p.impurem(); |
| |
| // But in this case we do not honor the loan: |
| p.blockm(|| { //~ ERROR cannot borrow `p` as mutable |
| p.x = 10; |
| }) |
| } |
| |
| fn b() { |
| let mut p = Point {x: 3, y: 4}; |
| |
| // Here I create an outstanding loan and check that we get conflicts: |
| |
| let l = &mut p; |
| p.impurem(); //~ ERROR cannot borrow |
| |
| l.x += 1; |
| } |
| |
| fn main() { |
| } |