error[E0255]: the name `A` is defined multiple times
  --> $DIR/issue-19498.rs:13:1
   |
11 | use self::A;
   |     ------- previous import of the module `A` here
12 | use self::B;
13 | mod A {} //~ ERROR the name `A` is defined multiple times
   | ^^^^^ `A` redefined here
   |
   = note: `A` must be defined only once in the type namespace of this module
help: You can use `as` to change the binding name of the import
   |
11 | use self::A as OtherA;
   |     ^^^^^^^^^^^^^^^^^

error[E0255]: the name `B` is defined multiple times
  --> $DIR/issue-19498.rs:15:1
   |
12 | use self::B;
   |     ------- previous import of the module `B` here
...
15 | pub mod B {} //~ ERROR the name `B` is defined multiple times
   | ^^^^^^^^^ `B` redefined here
   |
   = note: `B` must be defined only once in the type namespace of this module
help: You can use `as` to change the binding name of the import
   |
12 | use self::B as OtherB;
   |     ^^^^^^^^^^^^^^^^^

error[E0255]: the name `D` is defined multiple times
  --> $DIR/issue-19498.rs:19:5
   |
18 |     use C::D;
   |         ---- previous import of the module `D` here
19 |     mod D {} //~ ERROR the name `D` is defined multiple times
   |     ^^^^^ `D` redefined here
   |
   = note: `D` must be defined only once in the type namespace of this module
help: You can use `as` to change the binding name of the import
   |
18 |     use C::D as OtherD;
   |         ^^^^^^^^^^^^^^

error: aborting due to 3 previous errors