Looking for a recent error reporting change

Hi. In GHC 8.6.5, if I compile a main module that both fails to define `main` and also contains other errors, the other errors are not reported because GHC aborts after realizing that there is no `main`. In GHC 8.10.1, all errors are reported. I'm looking for where this change was made, in the hopes that it's easy to backport to a local branch of GHC 8.6.5. Does anyone know off-hand?