Add an MSRV note for retain_mut

cuviper · cuviper · commit 6b425e4e2166 · 2022-05-19T15:38:42.000-07:00
diff --git a/src/map/core.rs b/src/map/core.rs
@@ -399,6 +399,7 @@ impl<K, V> IndexMapCore<K, V> {
     where
         F: FnMut(&mut K, &mut V) -> bool,
     {
+        // FIXME: This could use Vec::retain_mut with MSRV 1.61.
         // Like Vec::retain in self.entries, but with mutable K and V.
         // We swap-shift all the items we want to keep, truncate the rest,
         // then rebuild the raw hash table with the new indexes.

Original file line number	Diff line number	Diff line change
`@@ -399,6 +399,7 @@ impl<K, V> IndexMapCore<K, V> {`
`399`	`399`	`where`
`400`	`400`	`F: FnMut(&mut K, &mut V) -> bool,`
`401`	`401`	`{`
	`402`	`+ // FIXME: This could use Vec::retain_mut with MSRV 1.61.`
`402`	`403`	`// Like Vec::retain in self.entries, but with mutable K and V.`
`403`	`404`	`// We swap-shift all the items we want to keep, truncate the rest,`
`404`	`405`	`// then rebuild the raw hash table with the new indexes.`