rust/src/test/ui/issues/issue-16966.stderr

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` (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`.