fix formatting nits

Author: RalfJung

src/librustc_mir/interpret/operand.rs

@@ -195,7 +195,7 @@ impl<'a, 'mir, 'tcx, M: Machine<'mir, 'tcx>> EvalContext<'a, 'mir, 'tcx, M> {
         self.memory.check_align(ptr, ptr_align)?;
 
         if mplace.layout.size.bytes() == 0 {
-            return Ok(Some(Value::Scalar(ScalarMaybeUndef::Scalar(Scalar::Bits { bits: 0, size: 0 }))));
+            return Ok(Some(Value::Scalar(Scalar::zst().into())));
         }
 
         let ptr = ptr.to_ptr()?;
@@ -228,7 +228,7 @@ impl<'a, 'mir, 'tcx, M: Machine<'mir, 'tcx>> EvalContext<'a, 'mir, 'tcx, M> {
     /// in a `Value`, not on which data is stored there currently.
     pub(super) fn try_read_value(
         &self,
-        src : OpTy<'tcx>,
+        src: OpTy<'tcx>,
     ) -> EvalResult<'tcx, Result<Value, MemPlace>> {
         Ok(match src.try_as_mplace() {
             Ok(mplace) => {
@@ -253,7 +253,7 @@ impl<'a, 'mir, 'tcx, M: Machine<'mir, 'tcx>> EvalContext<'a, 'mir, 'tcx, M> {
     }
 
     /// Read a scalar from a place
-    pub fn read_scalar(&self, op : OpTy<'tcx>) -> EvalResult<'tcx, ScalarMaybeUndef> {
+    pub fn read_scalar(&self, op: OpTy<'tcx>) -> EvalResult<'tcx, ScalarMaybeUndef> {
         match *self.read_value(op)? {
             Value::ScalarPair(..) => bug!("got ScalarPair for type: {:?}", op.layout.ty),
             Value::Scalar(val) => Ok(val),

src/librustc_mir/interpret/place.rs

@@ -403,7 +403,7 @@ impl<'a, 'mir, 'tcx, M: Machine<'mir, 'tcx>> EvalContext<'a, 'mir, 'tcx, M> {
     /// Just a convenience function, but used quite a bit.
     pub fn place_field(
         &mut self,
-        base : PlaceTy<'tcx>,
+        base: PlaceTy<'tcx>,
         field: u64,
     ) -> EvalResult<'tcx, PlaceTy<'tcx>> {
         // FIXME: We could try to be smarter and avoid allocation for fields that span the
@@ -414,7 +414,7 @@ impl<'a, 'mir, 'tcx, M: Machine<'mir, 'tcx>> EvalContext<'a, 'mir, 'tcx, M> {
 
     pub fn place_downcast(
         &mut self,
-        base : PlaceTy<'tcx>,
+        base: PlaceTy<'tcx>,
         variant: usize,
     ) -> EvalResult<'tcx, PlaceTy<'tcx>> {
         // Downcast just changes the layout
@@ -515,7 +515,7 @@ impl<'a, 'mir, 'tcx, M: Machine<'mir, 'tcx>> EvalContext<'a, 'mir, 'tcx, M> {
     pub fn write_value(
         &mut self,
         src_val: Value,
-        dest : PlaceTy<'tcx>,
+        dest: PlaceTy<'tcx>,
     ) -> EvalResult<'tcx> {
         trace!("write_value: {:?} <- {:?}", *dest, src_val);
         // See if we can avoid an allocation. This is the counterpart to `try_read_value`,

src/librustc_mir/interpret/terminator/drop.rs

@@ -2,7 +2,7 @@ use rustc::mir::BasicBlock;
 use rustc::ty::{self, layout::LayoutOf};
 use syntax::source_map::Span;
 
-use rustc::mir::interpret::{EvalResult};
+use rustc::mir::interpret::EvalResult;
 use interpret::{Machine, EvalContext, PlaceTy, PlaceExtra, OpTy, Operand};
 
 impl<'a, 'mir, 'tcx, M: Machine<'mir, 'tcx>> EvalContext<'a, 'mir, 'tcx, M> {