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

error: aborting due to previous error