Merge pull request #167 from cherryblossom000/antivirus

add note about antivirus for haskell installation

Author: tgdwyer

_chapters/haskell0.md

@@ -197,6 +197,8 @@ stack config set snapshot lts-23.25
 
 ## Troubleshooting
 
+For further issues, see [GHCup’s Troubleshooting page](https://www.haskell.org/ghcup/guide/#troubleshooting).
+
 ### Windows Issues
 
 #### `invalid argument (invalid character)`
@@ -243,6 +245,10 @@ Add the following line to the bottom of the file:
 local-programs-path: C:\stack-programs
 ```
 
+#### Script immediately exits
+
+If the script exits without installing anything, you might need to disable any third-party antivirus software.
+
 ### macOS Issues
 
 If you get an error that looks something like `fatal error: 'ffi.h'`, it may be because you do not have the Xcode command line tools installed.  (These are a collection of command line utilities and other developer tools that many programs rely on.) You can install them by running the following command in your terminal: