1 files changed, 12 insertions, 0 deletions
diff --git a/src/test/incremental/issue-49043.rs b/src/test/incremental/issue-49043.rs
new file mode 100644
index 000000000..50d8fb869
--- /dev/null
+++ b/src/test/incremental/issue-49043.rs
@@ -0,0 +1,12 @@
+// Regression test for hashing involving canonical variables.  In this
+// test -- which has an intensional error -- the type of the value
+// being dropped winds up including a type variable. Canonicalization
+// would then produce a `?0` which -- in turn -- triggered an ICE in
+// hashing.
+
+// revisions:cfail1
+
+fn main() {
+    println!("Hello, world! {}",*thread_rng().choose(&[0, 1, 2, 3]).unwrap());
+    //[cfail1]~^ ERROR cannot find function `thread_rng`
+}