diff options
Diffstat (limited to 'tests/ui/borrowck/borrowck-assign-comp-idx.rs')
-rw-r--r-- | tests/ui/borrowck/borrowck-assign-comp-idx.rs | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/tests/ui/borrowck/borrowck-assign-comp-idx.rs b/tests/ui/borrowck/borrowck-assign-comp-idx.rs new file mode 100644 index 000000000..f4dffeb8c --- /dev/null +++ b/tests/ui/borrowck/borrowck-assign-comp-idx.rs @@ -0,0 +1,39 @@ +struct Point { + x: isize, + y: isize, +} + +fn a() { + let mut p = vec![1]; + + // Create an immutable pointer into p's contents: + let q: &isize = &p[0]; + + p[0] = 5; //~ ERROR cannot borrow + + println!("{}", *q); +} + +fn borrow<F>(_x: &[isize], _f: F) where F: FnOnce() {} + +fn b() { + // here we alias the mutable vector into an imm slice and try to + // modify the original: + + let mut p = vec![1]; + + borrow( + &p, + || p[0] = 5); //~ ERROR cannot borrow `p` as mutable +} + +fn c() { + // Legal because the scope of the borrow does not include the + // modification: + let mut p = vec![1]; + borrow(&p, ||{}); + p[0] = 5; +} + +fn main() { +} |