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// Tests that two closures cannot simultaneously have mutable
// and immutable access to the variable. Issue #6801.
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::new(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::new(Foo { f: Box::new(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::new(Foo { f: Box::new(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() {
}
|
