tests/ui/lint/cli-lint-override.force_warn_deny.stderr

warning: extern declarations without an explicit ABI are deprecated
  --> $DIR/cli-lint-override.rs:12:1
   |
LL | extern fn foo() {}
   | ^^^^^^^^^^^^^^^ ABI should be specified here
   |
   = help: the default ABI is C
   = note: requested on the command line with `--force-warn missing-abi`

warning: 1 warning emitted