I am the ultimate dingus

thank you @saethlin

Co-authored-by: Ben Kimock <kimockb@gmail.com>

Author: clarfonthey

library/core/src/num/uint_macros.rs

@@ -1014,11 +1014,11 @@ macro_rules! uint_impl {
             unsafe {
                 let lhs = self;
                 intrinsics::assert_unsafe_precondition!(
-                    concat!(stringify!($SelfT), "::unchecked_shl cannot overflow"),
+                    concat!(stringify!($SelfT), "::unchecked_shr cannot overflow"),
                     (rhs: u32) => rhs < <$SelfT>::BITS
                 );
                 let rhs = conv_rhs_for_unchecked_shift!($SelfT, rhs);
-                intrinsics::unchecked_shl(lhs, rhs)
+                intrinsics::unchecked_shr(lhs, rhs)
             }
         }