error[E0583]: file not found for module `module_that_doesnt_exist`
  --> $DIR/E0583.rs:1:5
   |
LL | mod module_that_doesnt_exist; //~ ERROR E0583
   |     ^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: name the file either module_that_doesnt_exist.rs or module_that_doesnt_exist/mod.rs inside the directory "$DIR"

error: aborting due to previous error

For more information about this error, try `rustc --explain E0583`.