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// 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() {}
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