error: crate name using dashes are not valid in `extern crate` statements
  --> $DIR/bad-crate-name.rs:1:14
   |
LL | extern crate krate-name-here;
   |              ^^^^^^^^^^^^^^^ dash-separated idents are not valid
   |
help: if the original crate name uses dashes you need to use underscores in the code
   |
LL | extern crate krate_name_here;
   |                   ~    ~

error[E0463]: can't find crate for `krate_name_here`
  --> $DIR/bad-crate-name.rs:1:1
   |
LL | extern crate krate-name-here;
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ can't find crate

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0463`.