losing arguments in tuple patterns with `..`

[nrc]

https://github.com/rust-lang/rust/pull/35892/files/c23f4f54dd9554335b8c26e4f546c542d6b2f56e#r77568715

-            hir::ItemImpl(.., None, ref ty, _) => {
+            hir::ItemImpl(..) => {

[sinkuu]

dupe of #1021