diff --git a/src/librustc_mir/borrow_check/borrow_set.rs b/src/librustc_mir/borrow_check/borrow_set.rs
index 56dacf20edc..5ced497baa1 100644
--- a/src/librustc_mir/borrow_check/borrow_set.rs
+++ b/src/librustc_mir/borrow_check/borrow_set.rs
@@ -210,7 +210,7 @@ impl<'a, 'gcx, 'tcx> Visitor<'tcx> for GatherBorrows<'a, 'gcx, 'tcx> {
 
             self.insert_as_pending_if_two_phase(location, &assigned_place, kind, idx);
 
-            if let Some(local) = borrowed_place.root_local() {
+            if let Some(local) = borrowed_place.base_local() {
                 self.local_map.entry(local).or_default().insert(idx);
             }
         }
diff --git a/src/librustc_mir/borrow_check/place_ext.rs b/src/librustc_mir/borrow_check/place_ext.rs
index 913884a8218..cf9a6165d71 100644
--- a/src/librustc_mir/borrow_check/place_ext.rs
+++ b/src/librustc_mir/borrow_check/place_ext.rs
@@ -1,6 +1,6 @@
 use rustc::hir;
 use rustc::mir::ProjectionElem;
-use rustc::mir::{Local, Mir, Place, PlaceBase, Mutability, Static, StaticKind};
+use rustc::mir::{Mir, Place, PlaceBase, Mutability, Static, StaticKind};
 use rustc::ty::{self, TyCtxt};
 use crate::borrow_check::borrow_set::LocalsStateAtExit;
 
@@ -16,10 +16,6 @@ crate trait PlaceExt<'tcx> {
         mir: &Mir<'tcx>,
         locals_state_at_exit: &LocalsStateAtExit,
         ) -> bool;
-
-    /// If this is a place like `x.f.g`, returns the local
-    /// `x`. Returns `None` if this is based in a static.
-    fn root_local(&self) -> Option<Local>;
 }
 
 impl<'tcx> PlaceExt<'tcx> for Place<'tcx> {
@@ -82,15 +78,4 @@ impl<'tcx> PlaceExt<'tcx> for Place<'tcx> {
             },
         }
     }
-
-    fn root_local(&self) -> Option<Local> {
-        let mut p = self;
-        loop {
-            match p {
-                Place::Projection(pi) => p = &pi.base,
-                Place::Base(PlaceBase::Static(_)) => return None,
-                Place::Base(PlaceBase::Local(l)) => return Some(*l),
-            }
-        }
-    }
 }