[Haskell-beginners] Got "parse error on input ‘=’” in Emacs Intero REPL when define any function

[乃潇 张]

I find if I run “stack ghci intero” (remove the “—with-ghc”) from terminal, then the issue will not occur. Does anyone have idea why?

> On May 23, 2017, at 9:58 PM, 乃潇 张 <zhangnaixiao at me.com> wrote:
> 
> Hi, I am trying to define some functions in a REPL window of emacs intero. However, I always got "parse error on input ‘=’” as blow:
> 
> Starting:
>   stack ghci --with-ghc intero "--docker-run-args=--interactive=true --tty=false" --no-build --no-load --ghci-options -odir=/Users/spike/Code/haskell/learn-haskell/baby/.stack-work/intero/intero445zea --ghci-options -hidir=/Users/spike/Code/haskell/learn-haskell/baby/.stack-work/intero/intero445zea baby
> Intero 0.1.20 (GHC 8.0.2)
> Type :intro and press enter for an introduction of the standard commands.
> 
>  addTwo x y = x + y
> 
> <interactive>:2:12: error:
>     parse error on input ‘=’
>     Perhaps you need a 'let' in a 'do' block?
>     e.g. 'let x = 5' instead of 'x = 5’
> 
> I did some research, seems like “let” is not a must here for ghci version above 8.0. And my ghc version is 8.0.2. So is it a issue of ghci or intero?
> 
> 
> Thanks,
> Sid
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