Add or-patterns to pattern types

compiler/rustc_hir/src/hir.rs

@@ -1813,6 +1813,9 @@ pub enum TyPatKind<'hir> {
     /// A range pattern (e.g., `1..=2` or `1..2`).
     Range(&'hir ConstArg<'hir>, &'hir ConstArg<'hir>),
 
+    /// A list of patterns where only one needs to be satisfied
+    Or(&'hir [TyPat<'hir>]),
+
     /// A placeholder for a pattern that wasn't well formed in some way.
     Err(ErrorGuaranteed),
 }

compiler/rustc_hir/src/intravisit.rs

@@ -710,6 +710,7 @@ pub fn walk_ty_pat<'v, V: Visitor<'v>>(visitor: &mut V, pattern: &'v TyPat<'v>)
             try_visit!(visitor.visit_const_arg_unambig(lower_bound));
             try_visit!(visitor.visit_const_arg_unambig(upper_bound));
         }
+        TyPatKind::Or(patterns) => walk_list!(visitor, visit_pattern_type_pattern, patterns),
         TyPatKind::Err(_) => (),
     }
     V::Result::output()