Rollup merge of #147219 - Kivooeo:typeof-is-imposter, r=jdonszelmann

Add proper error handling for closure in impl

Fixes https://github.com/rust-lang/rust/issues/147146
Fixes https://github.com/rust-lang/rust/issues/146620

Not sure if it can cause any regressions or anything, as for test also have no idea where to store this one

cc ```@theemathas```

r? compiler

4 files changed, 32 insertions, 9 deletions

diff --git a/compiler/rustc_hir_analysis/src/coherence/inherent_impls.rs b/compiler/rustc_hir_analysis/src/coherence/inherent_impls.rs
index 38ae7852ca9..b069a74bf5a 100644
--- a/compiler/rustc_hir_analysis/src/coherence/inherent_impls.rs
+++ b/compiler/rustc_hir_analysis/src/coherence/inherent_impls.rs
@@ -195,11 +195,10 @@ impl<'tcx> InherentCollect<'tcx> {
             | ty::Closure(..)
             | ty::CoroutineClosure(..)
             | ty::Coroutine(..)
-            | ty::CoroutineWitness(..)
-            | ty::Alias(ty::Free, _)
-            | ty::Bound(..)
-            | ty::Placeholder(_)
-            | ty::Infer(_) => {
+            | ty::CoroutineWitness(..) => {
+                Err(self.tcx.dcx().delayed_bug("cannot define inherent `impl` for closure types"))
+            }
+            ty::Alias(ty::Free, _) | ty::Bound(..) | ty::Placeholder(_) | ty::Infer(_) => {
                 bug!("unexpected impl self type of impl: {:?} {:?}", id, self_ty);
             }
             // We could bail out here, but that will silence other useful errors.
diff --git a/compiler/rustc_hir_analysis/src/coherence/orphan.rs b/compiler/rustc_hir_analysis/src/coherence/orphan.rs
index 621431ae234..5a61248cab8 100644
--- a/compiler/rustc_hir_analysis/src/coherence/orphan.rs
+++ b/compiler/rustc_hir_analysis/src/coherence/orphan.rs
@@ -230,10 +230,12 @@ pub(crate) fn orphan_check_impl(
             ty::Closure(..)
             | ty::CoroutineClosure(..)
             | ty::Coroutine(..)
-            | ty::CoroutineWitness(..)
-            | ty::Bound(..)
-            | ty::Placeholder(..)
-            | ty::Infer(..) => {
+            | ty::CoroutineWitness(..) => {
+                return Err(tcx
+                    .dcx()
+                    .delayed_bug("cannot define inherent `impl` for closure types"));
+            }
+            ty::Bound(..) | ty::Placeholder(..) | ty::Infer(..) => {
                 let sp = tcx.def_span(impl_def_id);
                 span_bug!(sp, "weird self type for autotrait impl")
             }
diff --git a/tests/ui/closures/impl-closure-147146.rs b/tests/ui/closures/impl-closure-147146.rs
new file mode 100644
index 00000000000..b709e577354
--- /dev/null
+++ b/tests/ui/closures/impl-closure-147146.rs
@@ -0,0 +1,7 @@
+impl typeof(|| {}) {}
+//~^ ERROR `typeof` is a reserved keyword but unimplemented
+
+unsafe impl Send for typeof(|| {}) {}
+//~^ ERROR `typeof` is a reserved keyword but unimplemented
+
+fn main() {}
diff --git a/tests/ui/closures/impl-closure-147146.stderr b/tests/ui/closures/impl-closure-147146.stderr
new file mode 100644
index 00000000000..6da16b5d450
--- /dev/null
+++ b/tests/ui/closures/impl-closure-147146.stderr
@@ -0,0 +1,15 @@
+error[E0516]: `typeof` is a reserved keyword but unimplemented
+  --> $DIR/impl-closure-147146.rs:1:6
+   |
+LL | impl typeof(|| {}) {}
+   |      ^^^^^^^^^^^^^ reserved keyword
+
+error[E0516]: `typeof` is a reserved keyword but unimplemented
+  --> $DIR/impl-closure-147146.rs:4:22
+   |
+LL | unsafe impl Send for typeof(|| {}) {}
+   |                      ^^^^^^^^^^^^^ reserved keyword
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0516`.