Implement base_local iteratively

diff --git a/src/librustc/mir/mod.rs b/src/librustc/mir/mod.rs
index 0dc23f5ce47e58d1df1e58bbcd4bf3d38d77397d..f23ff47b5ff660635ef19b3ffd435986f5064f21 100644 (file)
--- a/src/librustc/mir/mod.rs
+++ b/src/librustc/mir/mod.rs
@@ -2055,10 +2055,13 @@ pub fn local(&self) -> Option<Local> {
 
     /// Finds the innermost `Local` from this `Place`.
     pub fn base_local(&self) -> Option<Local> {
-        match self {
-            Place::Base(PlaceBase::Local(local)) => Some(*local),
-            Place::Projection(box Projection { base, elem: _ }) => base.base_local(),
-            Place::Base(PlaceBase::Static(..)) => None,
+        let mut place = self;
+        loop {
+            match place {
+                Place::Projection(proj) => place = &proj.base,
+                Place::Base(PlaceBase::Static(_)) => return None,
+                Place::Base(PlaceBase::Local(local)) => return Some(*local),
+            }
         }
     }