error: use `.eq_ctxt()` instead of `.ctxt() == .ctxt()`
  --> $DIR/span_use_eq_ctxt.rs:14:5
   |
LL |     s.ctxt() == t.ctxt()
   |     ^^^^^^^^^^^^^^^^^^^^
   |
note: the lint level is defined here
  --> $DIR/span_use_eq_ctxt.rs:7:9
   |
LL | #![deny(rustc::span_use_eq_ctxt)]
   |         ^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to previous error