Can't remove old haskell
I've followed the steps here https://www.haskell.org/platform/linux.html#linux-generic; however, it doesn't replace or supercede an older version of ghci from my Ubuntu 18.04: 12:47:02:~$ which ghci /opt/ghc/8.0.2/bin/ghci 12:47:14:~$ ghci --version The Glorious Glasgow Haskell Compilation System, version 8.0.2 I've tried various removes, but to no avail. The newer version is on my system: 12:50:32:/usr/local/haskell/ghc-8.4.2-x86_64/bin$ ./ghci --version The Glorious Glasgow Haskell Compilation System, version 8.4.2 But I don't know what to do about this old "default" version. LB
Hello Lawrence, On Mon, May 14, 2018 at 12:52:01PM -0400, Lawrence Bottorff wrote:
I've tried various removes, but to no avail. The newer version is on my system:
There should be no need of removing the old version.
12:50:32:/usr/local/haskell/ghc-8.4.2-x86_64/bin$ ./ghci --version The Glorious Glasgow Haskell Compilation System, version 8.4.2
What does `echo $PATH` say? -F
PATH does indeed have /opt/ghc/8.0.2/bin which is no doubt why my command
line call gets version 8.0.2. But since I didn't put it there (I didn't add
it in my .bashrc; some older Haskell setup did?), I don't know how to get
it out. Also, I need to use Haskell in Emacs org-mode which tends not to go
by the $PATH in a Ubuntu GUI environment. So I've installed Emacs
haskell-mode (latest from melpa, I believe.) I start it up -- and it gives
me this:
The next big Haskell project is about to start!
If I break, you can:
1. Restart: M-x haskell-process-restart
2. Configure logging: C-h v haskell-process-log (useful for debugging)
3. General config: M-x customize-mode
4. Hide these tips: C-h v haskell-process-show-debug-tips
Changed directory: /home/hercynian/Programs/Haskell/
λ>
. . . but this doesn't tell me what version. Is there a Haskell REPL
command to find out what version?
On Mon, May 14, 2018 at 1:57 PM Francesco Ariis
Hello Lawrence,
On Mon, May 14, 2018 at 12:52:01PM -0400, Lawrence Bottorff wrote:
I've tried various removes, but to no avail. The newer version is on my system:
There should be no need of removing the old version.
12:50:32:/usr/local/haskell/ghc-8.4.2-x86_64/bin$ ./ghci --version The Glorious Glasgow Haskell Compilation System, version 8.4.2
What does `echo $PATH` say?
-F _______________________________________________ Beginners mailing list Beginners@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
λ> :t (<>)
(<>) :: Semigroup a => a -> a -> a
I'm curious what this is. I'm guessing it's something that later versions
can do?
On Mon, May 14, 2018 at 4:31 PM Francesco Ariis
On Mon, May 14, 2018 at 04:14:40PM -0400, Lawrence Bottorff wrote:
Is there a Haskell REPL command to find out what version?
Type
:t (<>)
inside the repl, if it gives an error you are still inside 8.0.2. _______________________________________________ Beginners mailing list Beginners@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
On Mon, May 14, 2018 at 06:17:33PM -0400, Lawrence Bottorff wrote:
λ> :t (<>) (<>) :: Semigroup a => a -> a -> a
I'm curious what this is. I'm guessing it's something that later versions can do?
Yes, since GHC 8.4 the operator `<>` is part of the Prelude. Congrats on 8.4.2 working!
participants (2)
-
Francesco Ariis -
Lawrence Bottorff