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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
commit | 698f8c2f01ea549d77d7dc3338a12e04c11057b9 (patch) | |
tree | 173a775858bd501c378080a10dca74132f05bc50 /src/test/ui/borrowck/borrowck-overloaded-index-ref-index.rs | |
parent | Initial commit. (diff) | |
download | rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.tar.xz rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.zip |
Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/test/ui/borrowck/borrowck-overloaded-index-ref-index.rs')
-rw-r--r-- | src/test/ui/borrowck/borrowck-overloaded-index-ref-index.rs | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/src/test/ui/borrowck/borrowck-overloaded-index-ref-index.rs b/src/test/ui/borrowck/borrowck-overloaded-index-ref-index.rs new file mode 100644 index 000000000..8adafaa8e --- /dev/null +++ b/src/test/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); +} |