| // Tests that two closures cannot simultaneously have mutable |
| // and immutable access to the variable. Issue #6801. |
| |
| #![feature(box_syntax)] |
| |
| fn get(x: &isize) -> isize { |
| *x |
| } |
| |
| fn set(x: &mut isize) { |
| *x = 4; |
| } |
| |
| fn a() { |
| let mut x = 3; |
| let c1 = || x = 4; |
| let c2 = || x * 5; |
| //~^ ERROR cannot borrow `x` as immutable because it is also borrowed as mutable |
| drop(c1); |
| } |
| |
| fn b() { |
| let mut x = 3; |
| let c1 = || set(&mut x); |
| let c2 = || get(&x); |
| //~^ ERROR cannot borrow `x` as immutable because it is also borrowed as mutable |
| drop(c1); |
| } |
| |
| fn c() { |
| let mut x = 3; |
| let c1 = || set(&mut x); |
| let c2 = || x * 5; |
| //~^ ERROR cannot borrow `x` as immutable because it is also borrowed as mutable |
| drop(c1); |
| } |
| |
| fn d() { |
| let mut x = 3; |
| let c2 = || x * 5; |
| x = 5; |
| //~^ ERROR cannot assign to `x` because it is borrowed |
| drop(c2); |
| } |
| |
| fn e() { |
| let mut x = 3; |
| let c1 = || get(&x); |
| x = 5; |
| //~^ ERROR cannot assign to `x` because it is borrowed |
| drop(c1); |
| } |
| |
| fn f() { |
| let mut x: Box<_> = box 3; |
| let c1 = || get(&*x); |
| *x = 5; |
| //~^ ERROR cannot assign to `*x` because it is borrowed |
| drop(c1); |
| } |
| |
| fn g() { |
| struct Foo { |
| f: Box<isize> |
| } |
| |
| let mut x: Box<_> = box Foo { f: box 3 }; |
| let c1 = || get(&*x.f); |
| *x.f = 5; |
| //~^ ERROR cannot assign to `*x.f` because it is borrowed |
| drop(c1); |
| } |
| |
| fn h() { |
| struct Foo { |
| f: Box<isize> |
| } |
| |
| let mut x: Box<_> = box Foo { f: box 3 }; |
| let c1 = || get(&*x.f); |
| let c2 = || *x.f = 5; |
| //~^ ERROR cannot borrow `x` as mutable because it is also borrowed as immutable |
| drop(c1); |
| } |
| |
| fn main() { |
| } |