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 <jeffbrown.the@gmail.com> 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 <will.yager@gmail.com> wrote:
https://hackage.haskell.org/package/parsec-3.1.9/docs/Text-Parsec-Token.html#v:reservedOp ?

--Will

On Fri, Feb 26, 2016 at 10:08 PM, Jeffrey Brown <jeffbrown.the@gmail.com> 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