Rollup merge of #139909 - oli-obk:or-patterns, r=BoxyUwU

implement or-patterns for pattern types

These are necessary to represent `NonZeroI32`, as the range for that is `..0 | 1..`. The `rustc_scalar_layout_range_*` attributes avoided this by just implementing wraparound and having a single `1..=-1` range effectively. See https://rust-lang.zulipchat.com/#narrow/channel/481660-t-lang.2Fpattern-types/topic/.60or.20pattern.60.20representation.20in.20type.20system/with/504217694 for some background discussion

cc https://github.com/rust-lang/rust/issues/123646

r? `@BoxyUwU`

1 files changed, 13 insertions, 0 deletions

diff --git a/compiler/rustc_hir_pretty/src/lib.rs b/compiler/rustc_hir_pretty/src/lib.rs
index b878147522d..2f8e6c0106f 100644
--- a/compiler/rustc_hir_pretty/src/lib.rs
+++ b/compiler/rustc_hir_pretty/src/lib.rs
@@ -1882,6 +1882,19 @@ impl<'a> State<'a> {
                 self.word("..=");
                 self.print_const_arg(end);
             }
+            TyPatKind::Or(patterns) => {
+                self.popen();
+                let mut first = true;
+                for pat in patterns {
+                    if first {
+                        first = false;
+                    } else {
+                        self.word(" | ");
+                    }
+                    self.print_ty_pat(pat);
+                }
+                self.pclose();
+            }
             TyPatKind::Err(_) => {
                 self.popen();
                 self.word("/*ERROR*/");