error[E0170]: pattern binding `C` is named the same as one of the variants of the type `Foo`
  --> $DIR/issue-88730.rs:12:8
   |
LL | fn foo(C: Foo) {}
   |        ^
   |
note: the lint level is defined here
  --> $DIR/issue-88730.rs:2:9
   |
LL | #![deny(bindings_with_variant_name)]
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^

error[E0170]: pattern binding `C` is named the same as one of the variants of the type `Foo`
  --> $DIR/issue-88730.rs:15:9
   |
LL |     let C = Foo::D;
   |         ^

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0170`.