pacify merciless fmt

(cherry picked from commit 6564403)

Author: Niko Matsakis

compiler/rustc_mir_build/src/build/scope.rs

@@ -1396,9 +1396,9 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
 }
 
 /// Builds drops for `pop_scope` and `leave_top_scope`.
-/// 
+///
 /// # Parameters
-/// 
+///
 /// * `unwind_drops`, the drop tree data structure storing what needs to be cleaned up if unwind occurs
 /// * `scope`, describes the drops that will occur on exiting the scope in regular execution
 /// * `block`, the block to branch to once drops are complete (assuming no unwind occurs)
@@ -1436,14 +1436,14 @@ fn build_scope_drops<'tcx>(
     // statement. For other functions we don't worry about StorageDead. The
     // drops for the unwind path should have already been generated by
     // `diverge_cleanup_gen`.
-    
+
     // `unwind_to` indicates what needs to be dropped should unwinding occur.
     // This is a subset of what needs to be dropped when exiting the scope.
     // As we unwind the scope, we will also move `unwind_to` backwards to match,
     // so that we can use it should a destructor panic.
     let mut unwind_to = unwind_to;
 
-    // The block that we should jump to after drops complete. We start by building the final drop (`drops[n]` 
+    // The block that we should jump to after drops complete. We start by building the final drop (`drops[n]`
     // in the diagram above) and then build the drops (e.g., `drop[1]`, `drop[0]`) that come before it.
     // block begins as the successor of `drops[n]` and then becomes `drops[n]` so that `drops[n-1]`
     // will branch to `drops[n]`.
@@ -1492,7 +1492,7 @@ fn build_scope_drops<'tcx>(
                     continue;
                 }
 
-                // As in the `DropKind::Storage` case below: 
+                // As in the `DropKind::Storage` case below:
                 // normally lint-related drops are not emitted for unwind,
                 // so we can just leave `unwind_to` unmodified, but in some
                 // cases we emit things ALSO on the unwind path, so we need to adjust