diff options
Diffstat (limited to 'src/test/ui/dynamically-sized-types/dst-deref.rs')
-rw-r--r-- | src/test/ui/dynamically-sized-types/dst-deref.rs | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/src/test/ui/dynamically-sized-types/dst-deref.rs b/src/test/ui/dynamically-sized-types/dst-deref.rs new file mode 100644 index 000000000..0a350bac1 --- /dev/null +++ b/src/test/ui/dynamically-sized-types/dst-deref.rs @@ -0,0 +1,30 @@ +// run-pass +// Test that a custom deref with a fat pointer return type does not ICE + + +use std::ops::Deref; + +pub struct Arr { + ptr: Box<[usize]> +} + +impl Deref for Arr { + type Target = [usize]; + + fn deref(&self) -> &[usize] { + &*self.ptr + } +} + +pub fn foo(arr: &Arr) { + assert_eq!(arr.len(), 3); + let x: &[usize] = &**arr; + assert_eq!(x[0], 1); + assert_eq!(x[1], 2); + assert_eq!(x[2], 3); +} + +fn main() { + let a = Arr { ptr: Box::new([1, 2, 3]) }; + foo(&a); +} |