Change ty.kind to a method

compiler/rustc_mir/src/const_eval/mod.rs

@@ -44,7 +44,7 @@ pub(crate) fn destructure_const<'tcx>(
     let op = ecx.const_to_op(val, None).unwrap();
 
     // We go to `usize` as we cannot allocate anything bigger anyway.
-    let (field_count, variant, down) = match val.ty.kind {
+    let (field_count, variant, down) = match val.ty.kind() {
         ty::Array(_, len) => (usize::try_from(len.eval_usize(tcx, param_env)).unwrap(), None, op),
         ty::Adt(def, _) if def.variants.is_empty() => {
             return mir::DestructuredConst { variant: None, fields: tcx.arena.alloc_slice(&[]) };