Make validate --testsuite-only behave correctly w.r.t. bindisttest
I'm in the process of validating. One of the error messages is a bit wrong, so I change the error message code. But the change is more than just the phrasing of the message; it's conceivable that a mistake in this edit will cause misbehavior, but only on rejected programs. So I determine that I don't need to re-run the full validation, but just recompile and run the testsuite. I recompile. I say
validate --testsuite-only. And then, after I read the results, I realize that validation uses the bindist version of the GHC, which isn't the one that I just built. So have to do it all again.
Thus, request: have
--testsuite-only not use the bindist version.