I&#39;m trying to define any simple function that spans multiple lines in ghci, take the following as an example:

    let abs n | n &gt;= 0 = n
              | otherwise = -n

So far I&#39;ve tried pressing Enter after the first line:

    Prelude&gt; let abs n | n &gt;= 0 = n
    Prelude&gt;           | otherwise = -n
    &lt;interactive&gt;:1:0: parse error on input `|&#39;

I&#39;ve also attempted to use the `:{` and `:}` commands but I don&#39;t get far:

    Prelude&gt; :{
    unknown command &#39;:{&#39;
    use :? for help.

I&#39;m using GHC Interactive version 6.6 for Haskell 98 on Linux, what am I missing?

How to define a function in ghci across multiple lines?

I am having problem in entering multi-line commands in ghci.

The following 2-line code works from a file:

    addTwo :: Int -&gt; Int -&gt; Int
    addTwo x y = x + y

But when I enter in ghci, I get an error:

&lt;!-- language: none --&gt;

    &lt;interactive&gt;:1:1: error:
        Variable not in scope: addTwo :: Int -&gt; Int -&gt; Int

I also tried putting the code inside `:{ ... :}`, but they are also not working for this example, because this is just appending the lines into one line, which should not be the case.

I am using WinGHCi, version 2011.2.0.1



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How to define a function in ghci across multiple lines?

Multi-line commands in GHCi