diff --git a/src/test/run-pass/issue-23649-1.rs b/src/test/run-pass/issue-23649-1.rs
new file mode 100644
index 0000000000000..a631898d8682a
--- /dev/null
+++ b/src/test/run-pass/issue-23649-1.rs
@@ -0,0 +1,21 @@
+// Copyright 2015 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.
+
+use std::mem;
+
+pub struct X([u8]);
+
+fn _f(x: &X) -> usize { match *x { X(ref x) =>  { x.len() } } }
+
+fn main() {
+    let b: &[u8] = &[11; 42];
+    let v: &X = unsafe { mem::transmute(b) };
+    assert_eq!(_f(v), 42);
+}
diff --git a/src/test/run-pass/issue-23649-2.rs b/src/test/run-pass/issue-23649-2.rs
new file mode 100644
index 0000000000000..018c0690f8ba7
--- /dev/null
+++ b/src/test/run-pass/issue-23649-2.rs
@@ -0,0 +1,18 @@
+// Copyright 2015 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.
+
+use std::collections::HashMap;
+use std::path::{Path, PathBuf};
+
+fn main() {
+    let m: HashMap<PathBuf, ()> = HashMap::new();
+    let k = Path::new("foo");
+    println!("{:?}", m.get(k));
+}
diff --git a/src/test/run-pass/issue-23649-3.rs b/src/test/run-pass/issue-23649-3.rs
new file mode 100644
index 0000000000000..4aa6c53ef9e23
--- /dev/null
+++ b/src/test/run-pass/issue-23649-3.rs
@@ -0,0 +1,14 @@
+// Copyright 2015 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.
+
+#[derive(PartialEq)]
+struct Slice { slice: [u8] }
+
+fn main() {}