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Diffstat (limited to '')
-rw-r--r-- | src/test/ui/issues/issue-16774.rs | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/src/test/ui/issues/issue-16774.rs b/src/test/ui/issues/issue-16774.rs new file mode 100644 index 000000000..9e9b84034 --- /dev/null +++ b/src/test/ui/issues/issue-16774.rs @@ -0,0 +1,46 @@ +// run-pass +#![feature(box_syntax)] +#![feature(box_patterns)] + +use std::ops::{Deref, DerefMut}; + +struct X(Box<isize>); + +static mut DESTRUCTOR_RAN: bool = false; + +impl Drop for X { + fn drop(&mut self) { + unsafe { + assert!(!DESTRUCTOR_RAN); + DESTRUCTOR_RAN = true; + } + } +} + +impl Deref for X { + type Target = isize; + + fn deref(&self) -> &isize { + let &X(box ref x) = self; + x + } +} + +impl DerefMut for X { + fn deref_mut(&mut self) -> &mut isize { + let &mut X(box ref mut x) = self; + x + } +} + +fn main() { + { + let mut test = X(box 5); + { + let mut change = || { *test = 10 }; + change(); + } + assert_eq!(*test, 10); + } + assert!(unsafe { DESTRUCTOR_RAN }); +} |