message: Let the cargo_bench_failing_test tolerate col info
  Needed by
diff: @@ -245,7 +245,7 @@ thread '[..]' panicked at 'assertion failed: \
  `(left == right)`[..]", p.url()))
  .with_stderr_contains("[..]left: `\"hello\"`[..]")
  .with_stderr_contains("[..]right: `\"nope\"`[..]")
  - .with_stderr_contains("[..]src[/]foo.rs:14")
  + .with_stderr_contains("[..]src[/]foo.rs:14[..]")
  .with_status(101));
  }
  