error[E0468]: an `extern crate` loading macros must be at the crate root
  --> $DIR/macro-crate-nonterminal-non-root.rs:5:5
   |
LL |     extern crate macro_crate_nonterminal;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0468`.