fix ICE when using raw ptr in a pattern

2 files changed, 33 insertions, 0 deletions

diff --git a/tests/ui/consts/const_in_pattern/null-raw-ptr-issue-119270.rs b/tests/ui/consts/const_in_pattern/null-raw-ptr-issue-119270.rs
new file mode 100644
index 00000000000..03e91f2b3b1
--- /dev/null
+++ b/tests/ui/consts/const_in_pattern/null-raw-ptr-issue-119270.rs
@@ -0,0 +1,19 @@
+// run-pass
+// Eventually this will be rejected (when the future-compat lints are turned into hard errors), and
+// then this test can be removed. But meanwhile we should ensure that this works and does not ICE.
+struct NoDerive(i32);
+
+#[derive(PartialEq)]
+struct WrapEmbedded(*const NoDerive);
+
+const WRAP_UNSAFE_EMBEDDED: &&WrapEmbedded = &&WrapEmbedded(std::ptr::null());
+
+fn main() {
+    let b = match WRAP_UNSAFE_EMBEDDED {
+        WRAP_UNSAFE_EMBEDDED => true,
+        //~^ WARN: must be annotated with `#[derive(PartialEq, Eq)]`
+        //~| previously accepted
+        _ => false,
+    };
+    assert!(b);
+}
diff --git a/tests/ui/consts/const_in_pattern/null-raw-ptr-issue-119270.stderr b/tests/ui/consts/const_in_pattern/null-raw-ptr-issue-119270.stderr
new file mode 100644
index 00000000000..c186d349e72
--- /dev/null
+++ b/tests/ui/consts/const_in_pattern/null-raw-ptr-issue-119270.stderr
@@ -0,0 +1,14 @@
+warning: to use a constant of type `WrapEmbedded` in a pattern, `WrapEmbedded` must be annotated with `#[derive(PartialEq, Eq)]`
+  --> $DIR/null-raw-ptr-issue-119270.rs:13:9
+   |
+LL |         WRAP_UNSAFE_EMBEDDED => true,
+   |         ^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #62411 <https://github.com/rust-lang/rust/issues/62411>
+   = note: the traits must be derived, manual `impl`s are not sufficient
+   = note: see https://doc.rust-lang.org/stable/std/marker/trait.StructuralEq.html for details
+   = note: `#[warn(indirect_structural_match)]` on by default
+
+warning: 1 warning emitted
+