error: crate is not marked with #![crate_okay]
  --> $DIR/issue-15778-fail.rs:5:1
   |
LL | / #![feature(plugin)]
LL | | #![plugin(lint_for_crate)]
LL | |
LL | | pub fn main() { }
   | |_________________^
   |
   = note: requested on the command line with `-D crate-not-okay`

error: aborting due to previous error