error: cannot glob-import all possible crates
  --> $DIR/edition-imports-2015.rs:23:5
   |
LL |     gen_glob!();
   |     ^^^^^^^^^^^
   |
   = note: this error originates in the macro `gen_glob` (in Nightly builds, run with -Z macro-backtrace for more info)

error: aborting due to 1 previous error