tidy

Author: cjgillot

compiler/rustc_mir_transform/src/gvn.rs

@@ -1712,7 +1712,10 @@ impl<'tcx> VnState<'_, 'tcx> {
         Some(ConstOperand { span: DUMMY_SP, user_ty: None, const_ })
     }
 
-    #[instrument(level="trace", skip(self), ret)]
+    /// Construct a place which holds the same value as `index` and for which all locals strictly
+    /// dominate `loc`. If you used this place, add its base local to `reused_locals` to remove
+    /// storage statements.
+    #[instrument(level = "trace", skip(self), ret)]
     fn try_as_place(&mut self, mut index: VnIndex, loc: Location) -> Option<Place<'tcx>> {
         let mut projection = SmallVec::<[PlaceElem<'tcx>; 1]>::new();
         loop {