message: test: allow some flexibility in check::error_from_deep_recursion's expected diagnostic.
diff: @@ -766,7 +766,7 @@ fn error_from_deep_recursion() -> Result<(), fmt::Error> {
  p.cargo("check --message-format=json")
  .with_status(101)
  .with_stdout_contains(
  - "[..]\"message\":\"recursion limit reached while expanding the macro `m`\"[..]",
  + "[..]\"message\":\"recursion limit reached while expanding [..]`m[..]`\"[..]",
  )
  .run();
  