Why does this piece of Scala code not compile?

Question

The error it yields is:

Funct.scala:5: 'val' expected but identifier found. [error] class Funct[In,Out](function: In => Out, description: String, implicit m: Manifest[In => Out]) {

and the code in question is:

import scala.reflect.Manifest; class Funct[In,Out](function: In => Out, description: String, implicit m: Manifest[In => Out]) { def isType[K](implicit man: Manifest[K]) = { m &lt;:&lt; man } def Apply(input: In): Out = { function.Apply(input) } def toString() = { description + m } }

I simply do not see what the problem is.

You left out the line from the error output with the carrot ^ showing where the parse error happened in the input line. (It's pointing at the m just after implicit.) — DaoWen
– DaoWen, Commented Aug 17, 2012 at 5:53

Kaito · Accepted Answer · 2012-08-17 01:44:37Z

There are a few problems you should be able to figure out, but the message is indeed a bit confusing.

The issue here is that the implicit keyword must mark the whole parameter group and not just individual parameters. Try:

class Funct[In,Out](function: In => Out, description: String)(implicit m: Manifest[In => Out])

Luigi Plinge · Accepted Answer · 2012-08-17 01:52:39Z

function.Apply(input) should be function.apply(input) or just function(input), but seriously, just use IntelliJ or Eclipse and they'll tell you these things immediately.

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