What's the difference between these two calls to a function taking a collection of structural types?
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by James Moore
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Published on 2010-05-16T20:18:05Z
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2010/05/16
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Why does the call to fn(Iterator("foo") compile, but the call to fn(fooIterator) fail with an error "type mismatch; found : Iterator[java.lang.String] required: scala.Iterator[com.banshee.Qx.HasLength]"
object Qx {
type HasLength = {def length: Int}
def fn(xs: Iterator[HasLength]) = 3
var tn = fn(Iterator("foo"))
var fooIterator = Iterator("foo")
var tnFails = fn(fooIterator) //doesn't compile
}
Aren't they the same thing?
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