error: compilation successful
  --> $DIR/dropck-eyepatch-extern-crate.rs:27:1
   |
LL | / fn main() { #![rustc_error] // rust-lang/rust#49855
LL | |     use std::cell::Cell;
LL | |     let c_long;
LL | |     let (c, mut dt, mut dr, mut pt, mut pr, st, sr)
...  |
LL | |     println!("{:?}", (dt.0, dr.0, pt.0, pr.0, st.0, sr.0));
LL | | }
   | |_^

error: aborting due to previous error