Add regression test

Author: oli-obk

src/test/run-pass/ctfe/ice-48279.rs

@@ -0,0 +1,34 @@
+// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// https://github.com/rust-lang/rust/issues/48279
+
+#![feature(const_fn)]
+
+#[derive(PartialEq, Eq)]
+pub struct NonZeroU32 {
+    value: u32
+}
+
+impl NonZeroU32 {
+    const unsafe fn new_unchecked(value: u32) -> Self {
+        NonZeroU32 { value }
+    }
+}
+
+//pub const FOO_ATOM: NonZeroU32 = unsafe { NonZeroU32::new_unchecked(7) };
+pub const FOO_ATOM: NonZeroU32 = unsafe { NonZeroU32 { value: 7 } };
+
+fn main() {
+    match None {
+        Some(FOO_ATOM) => {}
+        _ => {}
+    }
+}