From 1868b3344929c4532acb0206aed00cd1f9e15015 Mon Sep 17 00:00:00 2001
From: Maybe Waffle <waffle.lapkin@gmail.com>
Date: Fri, 5 Apr 2024 00:07:06 +0000
Subject: [PATCH] Set never type fallback = `!`

---
 compiler/rustc_hir_typeck/src/fn_ctxt/mod.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/compiler/rustc_hir_typeck/src/fn_ctxt/mod.rs b/compiler/rustc_hir_typeck/src/fn_ctxt/mod.rs
index 05e7c5b2b4188..2590eac800942 100644
--- a/compiler/rustc_hir_typeck/src/fn_ctxt/mod.rs
+++ b/compiler/rustc_hir_typeck/src/fn_ctxt/mod.rs
@@ -438,6 +438,11 @@ fn parse_never_type_options_attr(
     }
 
     let fallback = fallback.unwrap_or_else(|| {
+        if true {
+            // For a crater experiment, set `fallback = !`
+            return FallbackToNever;
+        }
+
         if tcx.features().never_type_fallback { FallbackToNiko } else { FallbackToUnit }
     });