From c529a0926a8bcca0e855ed3f56d98aa0c2a1e5fc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jana=20D=C3=B6nszelmann?= <jana@donsz.nl>
Date: Wed, 29 Apr 2026 10:53:45 +0200
Subject: [PATCH 1/2] Deny warnings in rustc crates on stable

---
 tests/run-make-cargo/rustc-crates-on-stable/rmake.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/run-make-cargo/rustc-crates-on-stable/rmake.rs b/tests/run-make-cargo/rustc-crates-on-stable/rmake.rs
index cbc1f24b8c16e..de29abfd7c3a2 100644
--- a/tests/run-make-cargo/rustc-crates-on-stable/rmake.rs
+++ b/tests/run-make-cargo/rustc-crates-on-stable/rmake.rs
@@ -10,7 +10,7 @@ fn main() {
         .env("RUSTC_STAGE", "0")
         .env("RUSTC", rustc_path())
         // We want to disallow all nightly features to simulate a stable build
-        .env("RUSTFLAGS", "-Zallow-features=")
+        .env("RUSTFLAGS", "-D warnings -Zallow-features=")
         .arg("build")
         .arg("--manifest-path")
         .arg(source_root().join("Cargo.toml"))

From 4b395835716cead45cd6d31727f7803fe2b243dd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jana=20D=C3=B6nszelmann?= <jana@donsz.nl>
Date: Wed, 29 Apr 2026 10:53:45 +0200
Subject: [PATCH 2/2] fix warnings in rustc_type_ir

---
 compiler/rustc_type_ir/src/binder.rs   | 12 ++++++++++--
 compiler/rustc_type_ir/src/ir_print.rs |  9 +++++----
 2 files changed, 15 insertions(+), 6 deletions(-)

diff --git a/compiler/rustc_type_ir/src/binder.rs b/compiler/rustc_type_ir/src/binder.rs
index 2b0dc221844ec..91f5d1733dafa 100644
--- a/compiler/rustc_type_ir/src/binder.rs
+++ b/compiler/rustc_type_ir/src/binder.rs
@@ -375,13 +375,21 @@ pub struct EarlyBinder<I: Interner, T> {
 
 impl<I: Interner, T: Eq> Eq for EarlyBinder<I, T> {}
 
+// FIXME(154045): Recommended as per https://github.com/rust-lang/rust/issues/154045, this is so sad :((
+#[cfg(feature = "nightly")]
+macro_rules! generate { ($( $tt:tt )*) => { $( $tt )* } }
+
 /// For early binders, you should first call `instantiate` before using any visitors.
 #[cfg(feature = "nightly")]
-impl<I: Interner, T> !TypeFoldable<I> for ty::EarlyBinder<I, T> {}
+generate!(
+    impl<I: Interner, T> !TypeFoldable<I> for ty::EarlyBinder<I, T> {}
+);
 
 /// For early binders, you should first call `instantiate` before using any visitors.
 #[cfg(feature = "nightly")]
-impl<I: Interner, T> !TypeVisitable<I> for ty::EarlyBinder<I, T> {}
+generate!(
+    impl<I: Interner, T> !TypeVisitable<I> for ty::EarlyBinder<I, T> {}
+);
 
 impl<I: Interner, T> EarlyBinder<I, T> {
     pub fn bind(value: T) -> EarlyBinder<I, T> {
diff --git a/compiler/rustc_type_ir/src/ir_print.rs b/compiler/rustc_type_ir/src/ir_print.rs
index 5af2bd811bab4..c6ab804d81c9f 100644
--- a/compiler/rustc_type_ir/src/ir_print.rs
+++ b/compiler/rustc_type_ir/src/ir_print.rs
@@ -1,11 +1,12 @@
 use std::fmt;
 
 use crate::{
-    AliasTerm, AliasTy, Binder, ClosureKind, CoercePredicate, ExistentialProjection,
-    ExistentialTraitRef, FnSig, HostEffectPredicate, Interner, NormalizesTo, OutlivesPredicate,
-    PatternKind, Placeholder, ProjectionPredicate, SubtypePredicate, TraitPredicate, TraitRef,
-    UnevaluatedConst,
+    AliasTerm, AliasTy, Binder, CoercePredicate, ExistentialProjection, ExistentialTraitRef, FnSig,
+    HostEffectPredicate, Interner, NormalizesTo, OutlivesPredicate, PatternKind, Placeholder,
+    ProjectionPredicate, SubtypePredicate, TraitPredicate, TraitRef,
 };
+#[cfg(feature = "nightly")]
+use crate::{ClosureKind, UnevaluatedConst};
 
 pub trait IrPrint<T> {
     fn print(t: &T, fmt: &mut fmt::Formatter<'_>) -> fmt::Result;