error[E0428]: the name `Foo` is defined multiple times
  --> $DIR/enum-and-module-in-same-scope.rs:15:1
   |
11 | enum Foo {
   | -------- previous definition of the type `Foo` here
...
15 | mod Foo { //~ ERROR the name `Foo` is defined multiple times
   | ^^^^^^^ `Foo` redefined here
   |
   = note: `Foo` must be defined only once in the type namespace of this module

error: aborting due to previous error