diff options
Diffstat (limited to 'src/test/ui/return/issue-82612-return-mutable-reference.rs')
-rw-r--r-- | src/test/ui/return/issue-82612-return-mutable-reference.rs | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/src/test/ui/return/issue-82612-return-mutable-reference.rs b/src/test/ui/return/issue-82612-return-mutable-reference.rs new file mode 100644 index 000000000..db0d08ddb --- /dev/null +++ b/src/test/ui/return/issue-82612-return-mutable-reference.rs @@ -0,0 +1,24 @@ +// Regression test for #82612. + +use std::marker::PhantomData; + +pub trait SparseSetIndex { + fn sparse_set_index(&self) -> usize; +} +pub struct SparseArray<I, V = I> { + values: Vec<Option<V>>, + marker: PhantomData<I>, +} + +impl<I: SparseSetIndex, V> SparseArray<I, V> { + pub fn get_or_insert_with(&mut self, index: I, func: impl FnOnce() -> V) -> &mut V { + let index = index.sparse_set_index(); + if index < self.values.len() { + let value = unsafe { self.values.get_unchecked_mut(index) }; + value.get_or_insert_with(func) //~ ERROR mismatched types + } + unsafe { self.values.get_unchecked_mut(index).as_mut().unwrap() } + } +} + +fn main() {} |