Move as_local impl to from Place to PlaceRef

Author: spastorino

src/librustc/mir/mod.rs

@@ -1924,10 +1924,7 @@ impl<'tcx> Place<'tcx> {
     /// If this place represents a local variable like `_X` with no
     /// projections, return `Some(_X)`.
     pub fn as_local(&self) -> Option<Local> {
-        match self {
-            Place { projection: box [], base: PlaceBase::Local(l) } => Some(*l),
-            _ => None,
-        }
+        self.as_ref().as_local()
     }
 
     pub fn as_ref(&self) -> PlaceRef<'_, 'tcx> {
@@ -1971,6 +1968,15 @@ impl<'a, 'tcx> PlaceRef<'a, 'tcx> {
             _ => None,
         }
     }
+
+    /// If this place represents a local variable like `_X` with no
+    /// projections, return `Some(_X)`.
+    pub fn as_local(&self) -> Option<Local> {
+        match self {
+            PlaceRef { base: PlaceBase::Local(l), projection: [] } => Some(*l),
+            _ => None,
+        }
+    }
 }
 
 impl Debug for Place<'_> {