Re: [Haskell-cafe] The 13-line example in Text.Megaparsec.Expr

27 Feb 2016


      In my previous email I perhaps should have also reported a second type of
error:

    example.hs:26:21:
        Couldn't match expected type ‘Text.Parsec.Token.GenTokenParser
                                        s0 u0 m0’
                    with actual type ‘[Char]’
        In the first argument of ‘prefix’, namely ‘"-"’
        In the expression: prefix "-" negate
        In the expression: [prefix "-" negate, prefix "+" id]

On Fri, Feb 26, 2016 at 10:05 PM, Jeffrey Brown 
wrote:
...
Thanks, Will. I had tried that, and got a lot of errors like this:
example.hs:20:26:
        Couldn't match type ‘Char’ with ‘()’
        Expected type: [()]
          Actual type: [Char]
        In the first argument of ‘symbol’, namely ‘"("’
        In the first argument of ‘between’, namely ‘(symbol "(")’
        In the expression: between (symbol "(") (symbol ")")
On Fri, Feb 26, 2016 at 8:20 PM, William Yager 
wrote:
...
https://hackage.haskell.org/package/parsec-3.1.9/docs/Text-Parsec-Token.html...
?
--Will
On Fri, Feb 26, 2016 at 10:08 PM, Jeffrey Brown 
wrote:
...
That still won't compile, because GHC does not know what reservedOp
means. Does reservedOp refer to something that no longer exists, or have I
just not found it?
--
Jeffrey Benjamin Brown
-- 
Jeffrey Benjamin Brown