diff --git a/src/codegen_i128.rs b/src/codegen_i128.rs
index cb048c0ad45..7b23041eee7 100644
--- a/src/codegen_i128.rs
+++ b/src/codegen_i128.rs
@@ -41,7 +41,7 @@ pub(crate) fn maybe_codegen<'tcx>(
                     fx.layout_of(if is_signed { fx.tcx.types.i128 } else { fx.tcx.types.u128 }),
                 ))
             } else {
-                let out_ty = fx.tcx.mk_tup([lhs.layout().ty, fx.tcx.types.bool].iter());
+                let out_ty = fx.tcx.intern_tup(&[lhs.layout().ty, fx.tcx.types.bool]);
                 let oflow = CPlace::new_stack_slot(fx, fx.layout_of(fx.tcx.types.i32));
                 let lhs = lhs.load_scalar(fx);
                 let rhs = rhs.load_scalar(fx);
@@ -63,7 +63,7 @@ pub(crate) fn maybe_codegen<'tcx>(
         }
         BinOp::Add | BinOp::Sub | BinOp::Mul => {
             assert!(checked);
-            let out_ty = fx.tcx.mk_tup([lhs.layout().ty, fx.tcx.types.bool].iter());
+            let out_ty = fx.tcx.intern_tup(&[lhs.layout().ty, fx.tcx.types.bool]);
             let out_place = CPlace::new_stack_slot(fx, fx.layout_of(out_ty));
             let param_types = vec![
                 AbiParam::special(fx.pointer_type, ArgumentPurpose::StructReturn),
diff --git a/src/intrinsics/llvm_x86.rs b/src/intrinsics/llvm_x86.rs
index d2ae6978ca2..cbac2e66765 100644
--- a/src/intrinsics/llvm_x86.rs
+++ b/src/intrinsics/llvm_x86.rs
@@ -191,7 +191,7 @@ fn llvm_add_sub<'tcx>(
     // carry0 | carry1 -> carry or borrow respectively
     let cb_out = fx.bcx.ins().bor(cb0, cb1);
 
-    let layout = fx.layout_of(fx.tcx.mk_tup([fx.tcx.types.u8, fx.tcx.types.u64].iter()));
+    let layout = fx.layout_of(fx.tcx.intern_tup(&[fx.tcx.types.u8, fx.tcx.types.u64]));
     let val = CValue::by_val_pair(cb_out, c, layout);
     ret.write_cvalue(fx, val);
 }
diff --git a/src/main_shim.rs b/src/main_shim.rs
index bc227df11c8..bb37a3612c1 100644
--- a/src/main_shim.rs
+++ b/src/main_shim.rs
@@ -119,7 +119,7 @@ pub(crate) fn maybe_create_entry_wrapper(
                     tcx,
                     ParamEnv::reveal_all(),
                     report.def_id,
-                    tcx.mk_substs([GenericArg::from(main_ret_ty)].iter()),
+                    tcx.intern_substs(&[GenericArg::from(main_ret_ty)]),
                 )
                 .unwrap()
                 .unwrap()
diff --git a/src/num.rs b/src/num.rs
index 51e79f85e02..7103289a93e 100644
--- a/src/num.rs
+++ b/src/num.rs
@@ -289,7 +289,7 @@ pub(crate) fn codegen_checked_int_binop<'tcx>(
         _ => bug!("binop {:?} on checked int/uint lhs: {:?} rhs: {:?}", bin_op, in_lhs, in_rhs),
     };
 
-    let out_layout = fx.layout_of(fx.tcx.mk_tup([in_lhs.layout().ty, fx.tcx.types.bool].iter()));
+    let out_layout = fx.layout_of(fx.tcx.intern_tup(&[in_lhs.layout().ty, fx.tcx.types.bool]));
     CValue::by_val_pair(res, has_overflow, out_layout)
 }