diff options
Diffstat (limited to 'tests/ui/borrowck/borrowck-overloaded-index-ref-index.rs')
-rw-r--r-- | tests/ui/borrowck/borrowck-overloaded-index-ref-index.rs | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/tests/ui/borrowck/borrowck-overloaded-index-ref-index.rs b/tests/ui/borrowck/borrowck-overloaded-index-ref-index.rs new file mode 100644 index 000000000..8adafaa8e --- /dev/null +++ b/tests/ui/borrowck/borrowck-overloaded-index-ref-index.rs @@ -0,0 +1,59 @@ +use std::ops::{Index, IndexMut}; + +struct Foo { + x: isize, + y: isize, +} + +impl<'a> Index<&'a String> for Foo { + type Output = isize; + + fn index(&self, z: &String) -> &isize { + if *z == "x" { + &self.x + } else { + &self.y + } + } +} + +impl<'a> IndexMut<&'a String> for Foo { + fn index_mut(&mut self, z: &String) -> &mut isize { + if *z == "x" { + &mut self.x + } else { + &mut self.y + } + } +} + +struct Bar { + x: isize, +} + +impl Index<isize> for Bar { + type Output = isize; + + fn index<'a>(&'a self, z: isize) -> &'a isize { + &self.x + } +} + +fn main() { + let mut f = Foo { + x: 1, + y: 2, + }; + let mut s = "hello".to_string(); + let rs = &mut s; + println!("{}", f[&s]); + //~^ ERROR cannot borrow `s` as immutable because it is also borrowed as mutable + f[&s] = 10; + //~^ ERROR cannot borrow `s` as immutable because it is also borrowed as mutable + let s = Bar { + x: 1, + }; + s[2] = 20; + //~^ ERROR cannot assign to data in an index of `Bar` + drop(rs); +} |