interpret: refactor projection code to work on a common trait, and use that for visitors

1 files changed, 2 insertions, 2 deletions

diff --git a/compiler/rustc_const_eval/src/interpret/step.rs b/compiler/rustc_const_eval/src/interpret/step.rs
index 619da8abb7d..319c422134c 100644
--- a/compiler/rustc_const_eval/src/interpret/step.rs
+++ b/compiler/rustc_const_eval/src/interpret/step.rs
@@ -8,7 +8,7 @@ use rustc_middle::mir;
 use rustc_middle::mir::interpret::{InterpResult, Scalar};
 use rustc_middle::ty::layout::LayoutOf;
 
-use super::{ImmTy, InterpCx, Machine};
+use super::{ImmTy, InterpCx, Machine, Projectable};
 use crate::util;
 
 impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
@@ -197,7 +197,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                     self.get_place_alloc_mut(&dest)?;
                 } else {
                     // Write the src to the first element.
-                    let first = self.mplace_field(&dest, 0)?;
+                    let first = self.project_index(&dest, 0)?;
                     self.copy_op(&src, &first.into(), /*allow_transmute*/ false)?;
 
                     // This is performance-sensitive code for big static/const arrays! So we