Hey there, let's work through this frustrating Intero error you're hitting. That "Abort trap: 6" tied to a type argument mismatch usually stems from version conflicts, environment issues, or outdated configs. Here's how to troubleshoot step by step:

1. Reinstall Intero with a GHC-compatible resolver #

Intero is tightly coupled to specific GHC versions—if your installed Intero binary doesn't match the GHC used in your project or system, it'll crash and trigger this Emacs error.

• First, uninstall the current problematic Intero:

  stack uninstall intero
  

• Reinstall it using the resolver that matches your project's stack.yaml (or your system's GHC version). For example, if you're using LTS 18.x:

  stack install intero --resolver lts-18.28
  

• Pro tip: Always use the same resolver for your project and Intero to avoid version mismatches.

2. Simplify your Emacs Intero config temporarily #

Outdated or conflicting custom config can cause parsing issues when Intero communicates with Emacs.

• Comment out any custom Intero-related hooks or settings in your .emacs or init.el, leaving only the basic activation:

  (add-hook 'haskell-mode-hook 'intero-mode)
  

• Restart Emacs and load a Haskell file. If the error goes away, gradually re-enable your custom config lines to find the culprit.

3. Ensure Emacs has access to the correct system PATH #

Emacs might not be loading your full system PATH, so it can't find the right Intero or GHC binaries.

• In Emacs, run M-x getenv RET PATH RET to check if ~/.local/bin (where Stack installs binaries) and your GHC installation path are included.
• If they're missing, add these lines to your Emacs config to update the path:

  (setenv "PATH" (concat (getenv "PATH") ":~/.local/bin"))
  (setq exec-path (append exec-path '("~/.local/bin")))
  

• For Mac users on zsh: Make sure Emacs uses your shell config by adding (setq shell-file-name "/bin/zsh") to your init file.

4. Use Emacs debug mode to pinpoint the trigger #

Even if you're new to Emacs debugging, this will help narrow down exactly what's causing the error.

• Run M-x toggle-debug-on-error to enable debug mode.
• Reload your Haskell file—when the error hits, Emacs will show a backtrace of the functions that failed.
• Look for functions starting with intero- (like intero-process-output or intero-parse-error)—this will tell you if the problem is with Intero crashing or Emacs failing to parse its output.

5. Consider upgrading Emacs (if possible) #

Emacs 25.3.1 is quite old (released in 2017), and newer versions have fixed many type-related bugs and improved compatibility with modern tools like Intero. If you can, upgrade to Emacs 27+ or the latest stable release—this might resolve the issue outright.

内容的提问来源于stack exchange，提问作者composerMike