Reduce size of statements

compiler/rustc_middle/src/mir/mod.rs

@@ -1470,7 +1470,7 @@ pub struct Statement<'tcx> {
 
 // `Statement` is used a lot. Make sure it doesn't unintentionally get bigger.
 #[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
-static_assert_size!(Statement<'_>, 40);
+static_assert_size!(Statement<'_>, 32);
 
 impl Statement<'_> {
     /// Changes a statement to a nop. This is both faster than deleting instructions and avoids
@@ -1500,7 +1500,7 @@ pub enum StatementKind<'tcx> {
     ///
     /// Note that this also is emitted for regular `let` bindings to ensure that locals that are
     /// never accessed still get some sanity checks for, e.g., `let x: ! = ..;`
-    FakeRead(FakeReadCause, Box<Place<'tcx>>),
+    FakeRead(Box<(FakeReadCause, Place<'tcx>)>),
 
     /// Write the discriminant for a variant to the enum Place.
     SetDiscriminant { place: Box<Place<'tcx>>, variant_index: VariantIdx },
@@ -1646,7 +1646,9 @@ impl Debug for Statement<'_> {
         use self::StatementKind::*;
         match self.kind {
             Assign(box (ref place, ref rv)) => write!(fmt, "{:?} = {:?}", place, rv),
-            FakeRead(ref cause, ref place) => write!(fmt, "FakeRead({:?}, {:?})", cause, place),
+            FakeRead(box (ref cause, ref place)) => {
+                write!(fmt, "FakeRead({:?}, {:?})", cause, place)
+            }
             Retag(ref kind, ref place) => write!(
                 fmt,
                 "Retag({}{:?})",

compiler/rustc_middle/src/mir/visit.rs

@@ -380,7 +380,7 @@ macro_rules! make_mir_visitor {
                     ) => {
                         self.visit_assign(place, rvalue, location);
                     }
-                    StatementKind::FakeRead(_, place) => {
+                    StatementKind::FakeRead(box (_, place)) => {
                         self.visit_place(
                             place,
                             PlaceContext::NonMutatingUse(NonMutatingUseContext::Inspect),

compiler/rustc_mir/src/borrow_check/diagnostics/conflict_errors.rs

@@ -1728,7 +1728,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
         impl<'tcx> Visitor<'tcx> for FakeReadCauseFinder<'tcx> {
             fn visit_statement(&mut self, statement: &Statement<'tcx>, _: Location) {
                 match statement {
-                    Statement { kind: StatementKind::FakeRead(cause, box place), .. }
+                    Statement { kind: StatementKind::FakeRead(box (cause, place)), .. }
                         if *place == self.place =>
                     {
                         self.cause = Some(*cause);

compiler/rustc_mir/src/borrow_check/diagnostics/explain_borrow.rs

@@ -515,7 +515,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                 let block = &self.body.basic_blocks()[location.block];
 
                 let kind = if let Some(&Statement {
-                    kind: StatementKind::FakeRead(FakeReadCause::ForLet(_), _),
+                    kind: StatementKind::FakeRead(box (FakeReadCause::ForLet(_), _)),
                     ..
                 }) = block.statements.get(location.statement_index)
                 {

compiler/rustc_mir/src/borrow_check/diagnostics/mod.rs

@@ -796,7 +796,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
 
         // StatementKind::FakeRead only contains a def_id if they are introduced as a result
         // of pattern matching within a closure.
-        if let StatementKind::FakeRead(cause, box ref place) = stmt.kind {
+        if let StatementKind::FakeRead(box (cause, ref place)) = stmt.kind {
             match cause {
                 FakeReadCause::ForMatchedPlace(Some(closure_def_id))
                 | FakeReadCause::ForLet(Some(closure_def_id)) => {

compiler/rustc_mir/src/borrow_check/invalidation.rs

@@ -62,7 +62,7 @@ impl<'cx, 'tcx> Visitor<'tcx> for InvalidationGenerator<'cx, 'tcx> {
 
                 self.mutate_place(location, *lhs, Shallow(None), JustWrite);
             }
-            StatementKind::FakeRead(_, _) => {
+            StatementKind::FakeRead(box (_, _)) => {
                 // Only relevant for initialized/liveness/safety checks.
             }
             StatementKind::SetDiscriminant { place, variant_index: _ } => {

compiler/rustc_mir/src/borrow_check/mod.rs

@@ -573,7 +573,7 @@ impl<'cx, 'tcx> dataflow::ResultsVisitor<'cx, 'tcx> for MirBorrowckCtxt<'cx, 'tc
 
                 self.mutate_place(location, (*lhs, span), Shallow(None), JustWrite, flow_state);
             }
-            StatementKind::FakeRead(_, box ref place) => {
+            StatementKind::FakeRead(box (_, ref place)) => {
                 // Read for match doesn't access any memory and is used to
                 // assert that a place is safe and live. So we don't have to
                 // do any checks here.

compiler/rustc_mir/src/dataflow/move_paths/builder.rs

@@ -292,8 +292,8 @@ impl<'b, 'a, 'tcx> Gatherer<'b, 'a, 'tcx> {
                 }
                 self.gather_rvalue(rval);
             }
-            StatementKind::FakeRead(_, place) => {
-                self.create_move_path(**place);
+            StatementKind::FakeRead(box (_, place)) => {
+                self.create_move_path(*place);
             }
             StatementKind::LlvmInlineAsm(ref asm) => {
                 for (output, kind) in asm.outputs.iter().zip(&asm.asm.outputs) {

compiler/rustc_mir/src/transform/coverage/spans.rs

@@ -683,10 +683,10 @@ pub(super) fn filtered_statement_span(
         // and `_1` is the `Place` for `somenum`.
         //
         // If and when the Issue is resolved, remove this special case match pattern:
-        StatementKind::FakeRead(cause, _) if cause == FakeReadCause::ForGuardBinding => None,
+        StatementKind::FakeRead(box (cause, _)) if cause == FakeReadCause::ForGuardBinding => None,
 
         // Retain spans from all other statements
-        StatementKind::FakeRead(_, _) // Not including `ForGuardBinding`
+        StatementKind::FakeRead(box (_, _)) // Not including `ForGuardBinding`
         | StatementKind::CopyNonOverlapping(..)
         | StatementKind::Assign(_)
         | StatementKind::SetDiscriminant { .. }

compiler/rustc_mir_build/src/build/cfg.rs

@@ -80,7 +80,7 @@ impl<'tcx> CFG<'tcx> {
         cause: FakeReadCause,
         place: Place<'tcx>,
     ) {
-        let kind = StatementKind::FakeRead(cause, box place);
+        let kind = StatementKind::FakeRead(box (cause, place));
         let stmt = Statement { source_info, kind };
         self.push(block, stmt);
     }