1 files changed, 16 insertions, 0 deletions

diff --git a/src/test/ui/issues/issue-16966.stderr b/src/test/ui/issues/issue-16966.stderr
new file mode 100644
index 000000000..8524a62a0
--- /dev/null
+++ b/src/test/ui/issues/issue-16966.stderr
@@ -0,0 +1,16 @@
+error[E0282]: type annotations needed
+  --> $DIR/issue-16966.rs:2:5
+   |
+LL |     panic!(std::default::Default::default());
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot infer type of the type parameter `M` declared on the function `begin_panic`
+   |
+   = note: this error originates in the macro `$crate::panic::panic_2015` which comes from the expansion of the macro `panic` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: consider specifying the generic argument
+  --> $SRC_DIR/std/src/panic.rs:LL:COL
+   |
+LL |         $crate::rt::begin_panic::<M>($msg)
+   |                                +++++
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0282`.