src/test/ui/lint/cli-lint-override.forbid_warn.stderr

error: 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 `-F missing-abi`

error: aborting due to previous error