cmse: fix 'region variables should not be hashed'

compiler/rustc_hir_analysis/src/hir_ty_lowering/cmse.rs

@@ -128,6 +128,7 @@ fn is_valid_cmse_inputs<'tcx>(
 
     // this type is only used for layout computation, which does not rely on regions
     let fn_sig = tcx.instantiate_bound_regions_with_erased(fn_sig);
+    let fn_sig = tcx.erase_and_anonymize_regions(fn_sig);
 
     for (index, ty) in fn_sig.inputs().iter().enumerate() {
         let layout = tcx.layout_of(ty::TypingEnv::fully_monomorphized().as_query_input(*ty))?;

tests/ui/cmse-nonsecure/cmse-nonsecure-call/undeclared-lifetime.rs

@@ -0,0 +1,20 @@
+//@ add-core-stubs
+//@ compile-flags: --target thumbv8m.main-none-eabi --crate-type lib -Cincremental=true
+//@ needs-llvm-components: arm
+#![feature(abi_cmse_nonsecure_call, no_core)]
+#![no_core]
+
+extern crate minicore;
+use minicore::*;
+
+// A regression test for https://github.com/rust-lang/rust/issues/131639.
+// NOTE: -Cincremental=true was required for triggering the bug.
+
+fn foo() {
+    id::<extern "cmse-nonsecure-call" fn(&'a ())>(PhantomData);
+    //~^ ERROR use of undeclared lifetime name `'a`
+}
+
+fn id<T>(x: PhantomData<T>) -> PhantomData<T> {
+    x
+}

tests/ui/cmse-nonsecure/cmse-nonsecure-call/undeclared-lifetime.stderr

@@ -0,0 +1,19 @@
+error[E0261]: use of undeclared lifetime name `'a`
+  --> $DIR/undeclared-lifetime.rs:14:43
+   |
+LL |     id::<extern "cmse-nonsecure-call" fn(&'a ())>(PhantomData);
+   |                                           ^^ undeclared lifetime
+   |
+   = note: for more information on higher-ranked polymorphism, visit https://doc.rust-lang.org/nomicon/hrtb.html
+help: consider making the type lifetime-generic with a new `'a` lifetime
+   |
+LL |     id::<for<'a> extern "cmse-nonsecure-call" fn(&'a ())>(PhantomData);
+   |          +++++++
+help: consider introducing lifetime `'a` here
+   |
+LL | fn foo<'a>() {
+   |       ++++
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0261`.