Change ShallowDrop to Free, so that it matches what trans will do

Author: nikomatsakis

src/librustc_mir/build/expr/as_rvalue.rs

@@ -71,7 +71,7 @@ impl<'a,'tcx> Builder<'a,'tcx> {
 
                 // schedule a shallow free of that memory, lest we unwind:
                 let extent = this.extent_of_innermost_scope().unwrap();
-                this.schedule_drop(expr_span, extent, DropKind::Shallow, &result, value_ty);
+                this.schedule_drop(expr_span, extent, DropKind::Free, &result, value_ty);
 
                 // initialize the box contents:
                 let contents = result.clone().deref();

src/librustc_mir/repr.rs

@@ -355,16 +355,16 @@ pub enum StatementKind<'tcx> {
 
 #[derive(Copy, Clone, Debug, PartialEq, Eq)]
 pub enum DropKind {
-    Shallow,
-    Deep,
+    Free, // free a partially constructed box, should go away eventually
+    Deep
 }
 
 impl<'tcx> Debug for Statement<'tcx> {
     fn fmt(&self, fmt: &mut Formatter) -> Result<(), Error> {
         use self::StatementKind::*;
         match self.kind {
             Assign(ref lv, ref rv) => write!(fmt, "{:?} = {:?}", lv, rv),
-            Drop(DropKind::Shallow, ref lv) => write!(fmt, "shallow_drop {:?}", lv),
+            Drop(DropKind::Free, ref lv) => write!(fmt, "free {:?}", lv),
             Drop(DropKind::Deep, ref lv) => write!(fmt, "drop {:?}", lv),
         }
     }