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, 11 insertions, 0 deletions

diff --git a/compiler/rustc_ast_pretty/src/pprust/state.rs b/compiler/rustc_ast_pretty/src/pprust/state.rs
index 985359e1234..80c315c2495 100644
--- a/compiler/rustc_ast_pretty/src/pprust/state.rs
+++ b/compiler/rustc_ast_pretty/src/pprust/state.rs
@@ -1158,6 +1158,17 @@ impl<'a> State<'a> {
                     self.print_expr_anon_const(end, &[]);
                 }
             }
+            rustc_ast::TyPatKind::Or(variants) => {
+                let mut first = true;
+                for pat in variants {
+                    if first {
+                        first = false
+                    } else {
+                        self.word(" | ");
+                    }
+                    self.print_ty_pat(pat);
+                }
+            }
             rustc_ast::TyPatKind::Err(_) => {
                 self.popen();
                 self.word("/*ERROR*/");