warning: trait item `hello` from `C` shadows identically named item from supertrait
  --> $DIR/common-ancestor-2.rs:24:5
   |
LL |     fn hello(&self) {
   |     ^^^^^^^^^^^^^^^
   |
note: items from several supertraits are shadowed: `B` and `A`
  --> $DIR/common-ancestor-2.rs:10:5
   |
LL |     fn hello(&self) {
   |     ^^^^^^^^^^^^^^^
...
LL |     fn hello(&self) {
   |     ^^^^^^^^^^^^^^^
note: the lint level is defined here
  --> $DIR/common-ancestor-2.rs:6:9
   |
LL | #![warn(supertrait_item_shadowing_definition)]
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

warning: trait item `hello` from `C` shadows identically named item from supertrait
  --> $DIR/common-ancestor-2.rs:32:8
   |
LL |     ().hello();
   |        ^^^^^
   |
note: item from `C` shadows a supertrait item
  --> $DIR/common-ancestor-2.rs:24:5
   |
LL |     fn hello(&self) {
   |     ^^^^^^^^^^^^^^^
note: items from several supertraits are shadowed: `A` and `B`
  --> $DIR/common-ancestor-2.rs:10:5
   |
LL |     fn hello(&self) {
   |     ^^^^^^^^^^^^^^^
...
LL |     fn hello(&self) {
   |     ^^^^^^^^^^^^^^^
note: the lint level is defined here
  --> $DIR/common-ancestor-2.rs:5:9
   |
LL | #![warn(supertrait_item_shadowing_usage)]
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

warning: 2 warnings emitted