In a freshly cloned GHC code base (c6462ab0...), in my system,`make test TEST="T13780c T13822"` fails.

That is while `./validate` passes.

I am rather new to GHC code base, and not so familiar with its build and testing system.

So I was wondering whether this is an intended behaviour (e.g., some test cases are intentionally left out of `./validate`).

Specifically, I follow the following steps:

(1) `git clone --recursive git://git.haskell.org/ghc.git`

(2) `cd ghc`

(3) `cp mk/build.mk.sample mk/build.mk`

(4) set `BuildFlavour = devel2` and then

(5) ./boot

(6) ./configure

(7) make -j4

(8) make test TEST="T13780c T13822"

I build in a variant of the docker image for GHC development on Linux (64 bit), if it matters.

As it seems, Alan also gets the similar result on his system.

I am investigating this, since my development of Growable ASTs is stalled due to some "GHC panic bug" when validating.

(In my repo[1], I can successfully build with steps (2)-(7) above but `./validate` (and `make test TEST="T13780c T13822"`) fails)

Thanks,

Shayan