Simon,
I tracked T7891 and tc124 failure down to simplifier, namely
`simplExprF1` for `Case`. Core lint catches the bug (requires -O1 at
least), but without -dcore-lint compiler hangs in busy loop. I made it
work with simple patch:
> diff --git a/compiler/simplCore/Simplify.hs b/compiler/simplCo
Hi devs,
I've just hit on (what I view to be) a design wart in what is allowed in an
instance context inferred through the use of non-standalone `deriving`. I've
posed a problem and potential solution in #8984
(https://ghc.haskell.org/trac/ghc/ticket/8984#comment:6). See Note [Exotic
derived i
Ok, so I found that it was an instance of this:
https://ghc.haskell.org/trac/ghc/ticket/1168
and I read through this whole thread:
https://www.haskell.org/pipermail/glasgow-haskell-users/2008-February/014259.html
I don't understand the state-hack optimization. It's clearly not safe and
I'm not co
I wrote:
> Aha! Thanks [to Bryan] for this explanation of what I have been
> suffering from...
> I can't wait for the point releases. I'll go with HEAD on one
> of the branches for now.
Unfortunately, this patch did *not* fix what I have been suffering from.
I'm still getting segfaults.
I'll desc
Hi devs,
There are various times when we want to make some change to a large number of
lines/files, but the change is very very boring. Two somewhat recent cases that
come to mind are de-tabbing and the .lhs -> .hs conversion. These sorts of
changes cause painful merges for anyone who is workin
Hi devs,
Previously, I've had much success with the THREADS environment variable for
getting the testsuite to run multiple tests in parallel. This no longer seems
to be working on my Macs. Is this an expected change? Is there something I can
do to fix this locally? It takes a long time to run t
Hi,
Am Samstag, den 06.12.2014, 16:19 +0100 schrieb Joachim Breitner:
> nevermind, I found
> https://ghc.haskell.org/trac/ghc/ticket/9552 and
> https://git.haskell.org/ghc.git/patch/2a8ea4745d6ff79d6ce17961a64d9013243fc3c6
> and will try with these.
>
> Once I get it to compile I’ll give a compl
