error: module has the same name as its containing module
  --> $DIR/module_inception.rs:14:9
   |
14 | /         mod bar {
15 | |             mod foo {}
16 | |         }
   | |_________^
   |
   = note: `-D clippy::module-inception` implied by `-D warnings`

error: module has the same name as its containing module
  --> $DIR/module_inception.rs:19:5
   |
19 | /     mod foo {
20 | |         mod bar {}
21 | |     }
   | |_____^

error: aborting due to 2 previous errors