From 2149d73358b648ee7c6f9635a123bb8aa6bb2009 Mon Sep 17 00:00:00 2001
From: Matthew Jasper <mjjasper1@gmail.com>
Date: Sat, 1 Dec 2018 15:04:07 +0000
Subject: [PATCH] Remove unnecessary borrow generation

---
 src/librustc_mir/dataflow/impls/borrows.rs | 14 --------------
 1 file changed, 14 deletions(-)

diff --git a/src/librustc_mir/dataflow/impls/borrows.rs b/src/librustc_mir/dataflow/impls/borrows.rs
index 518fbaae6271f..0ceff4aa04898 100644
--- a/src/librustc_mir/dataflow/impls/borrows.rs
+++ b/src/librustc_mir/dataflow/impls/borrows.rs
@@ -279,20 +279,6 @@ impl<'a, 'gcx, 'tcx> BitDenotation<'tcx> for Borrows<'a, 'gcx, 'tcx> {
                     });
 
                     sets.gen(*index);
-
-                    // Issue #46746: Two-phase borrows handles
-                    // stmts of form `Tmp = &mut Borrow` ...
-                    match lhs {
-                        Place::Promoted(_) |
-                        Place::Local(..) | Place::Static(..) => {} // okay
-                        Place::Projection(..) => {
-                            // ... can assign into projections,
-                            // e.g., `box (&mut _)`. Current
-                            // conservative solution: force
-                            // immediate activation here.
-                            sets.gen(*index);
-                        }
-                    }
                 }
             }