Put `LayoutError` behind reference to shrink result

`LayoutError` is 24 bytes, which is bigger than the `Ok` types, so let's
shrink that.

1 files changed, 4 insertions, 4 deletions

diff --git a/compiler/rustc_transmute/src/layout/tree.rs b/compiler/rustc_transmute/src/layout/tree.rs
index 6b718be7b15..be434eb7d00 100644
--- a/compiler/rustc_transmute/src/layout/tree.rs
+++ b/compiler/rustc_transmute/src/layout/tree.rs
@@ -192,8 +192,8 @@ pub(crate) mod rustc {
         TypeError(ErrorGuaranteed),
     }
 
-    impl<'tcx> From<LayoutError<'tcx>> for Err {
-        fn from(err: LayoutError<'tcx>) -> Self {
+    impl<'tcx> From<&LayoutError<'tcx>> for Err {
+        fn from(err: &LayoutError<'tcx>) -> Self {
             match err {
                 LayoutError::Unknown(..) => Self::UnknownLayout,
                 err => unimplemented!("{:?}", err),
@@ -221,7 +221,7 @@ pub(crate) mod rustc {
     }
 
     impl LayoutSummary {
-        fn from_ty<'tcx>(ty: Ty<'tcx>, ctx: TyCtxt<'tcx>) -> Result<Self, LayoutError<'tcx>> {
+        fn from_ty<'tcx>(ty: Ty<'tcx>, ctx: TyCtxt<'tcx>) -> Result<Self, &'tcx LayoutError<'tcx>> {
             use rustc_middle::ty::ParamEnvAnd;
             use rustc_target::abi::{TyAndLayout, Variants};
 
@@ -482,7 +482,7 @@ pub(crate) mod rustc {
     fn layout_of<'tcx>(
         ctx: TyCtxt<'tcx>,
         ty: Ty<'tcx>,
-    ) -> Result<alloc::Layout, LayoutError<'tcx>> {
+    ) -> Result<alloc::Layout, &'tcx LayoutError<'tcx>> {
         use rustc_middle::ty::ParamEnvAnd;
         use rustc_target::abi::TyAndLayout;