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Document that Index ops can panic on HashMap & BTreeMap.

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Fixes https://github.com/rust-lang/rust/issues/47011.
This commit is contained in:
Corey Farwell 2018-01-28 21:50:01 -05:00
parent 21882aad72
commit 7b4cbbd12d
2 changed files with 12 additions and 2 deletions
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5
src/liballoc/btree/map.rs
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@ -1748,6 +1748,11 @@ impl<'a, K: Ord, Q: ?Sized, V> Index<&'a Q> for BTreeMap<K, V>
{ {
type Output = V; type Output = V;
/// Returns a reference to the value corresponding to the supplied key.
///
/// # Panics
///
/// Panics if the key is not present in the `BTreeMap`.
#[inline] #[inline]
fn index(&self, key: &Q) -> &V { fn index(&self, key: &Q) -> &V {
self.get(key).expect("no entry found for key") self.get(key).expect("no entry found for key")

9
src/libstd/collections/hash/map.rs
View File

@ -1384,9 +1384,14 @@ impl<'a, K, Q: ?Sized, V, S> Index<&'a Q> for HashMap<K, V, S>
{ {
type Output = V; type Output = V;
/// Returns a reference to the value corresponding to the supplied key.
///
/// # Panics
///
/// Panics if the key is not present in the `HashMap`.
#[inline] #[inline]
fn index(&self, index: &Q) -> &V { fn index(&self, key: &Q) -> &V {
self.get(index).expect("no entry found for key") self.get(key).expect("no entry found for key")
} }
} }