1 files changed, 4 insertions, 1 deletions
diff --git a/compiler/rustc_codegen_ssa/src/mir/rvalue.rs b/compiler/rustc_codegen_ssa/src/mir/rvalue.rs
index bd11d47500a..94de19a9c29 100644
--- a/compiler/rustc_codegen_ssa/src/mir/rvalue.rs
+++ b/compiler/rustc_codegen_ssa/src/mir/rvalue.rs
@@ -666,13 +666,16 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
                 }
             }
 
-            mir::Rvalue::NullaryOp(null_op, ty) => {
+            mir::Rvalue::NullaryOp(ref null_op, ty) => {
                 let ty = self.monomorphize(ty);
                 assert!(bx.cx().type_is_sized(ty));
                 let layout = bx.cx().layout_of(ty);
                 let val = match null_op {
                     mir::NullOp::SizeOf => layout.size.bytes(),
                     mir::NullOp::AlignOf => layout.align.abi.bytes(),
+                    mir::NullOp::OffsetOf(fields) => {
+                        layout.offset_of_subfield(bx.cx(), fields.iter().map(|f| f.index())).bytes()
+                    }
                 };
                 let val = bx.cx().const_usize(val);
                 let tcx = self.cx.tcx();