CODEWITHSUNDEEP
scaladynamic
missingfaktor
missingfaktor

Reputation: 92066

Some code using Dynamic fails to work inside blocks

Here's some code using Dynamic. As you can see, the part below works as expected.

scala> import language.dynamics
import language.dynamics                                                     

scala> class ExpandoObject extends Dynamic {
     |   private val dict = collection.mutable.Map.empty[String, Any]
     |   def selectDynamic(name: String): Any = dict(name)
     |   def updateDynamic(name: String)(arg: Any) = dict(name) = arg
     | }
defined class ExpandoObject

scala> val e = new ExpandoObject
e: ExpandoObject = ExpandoObject@14e03fec

scala> e.name = "rahul"
e.name: Any = rahul

scala> e.name
res62: Any = rahul

However when you use it in some block, it fails to work.

scala> {
     |   val e = new ExpandoObject
     |   e.name = "rahul"
     | }
<console>:20: error: reassignment to val
                e.name = "rahul"
                       ^

scala>

Again, if you call updateDynamic explicitly, it works.

scala> {
     |   val e = new ExpandoObject
     |   e.updateDynamic("name")("rahul")
     |   e
     | }
res66: ExpandoObject = ExpandoObject@3f755bd2

scala> res66.name
res67: Any = rahul

Is this a bug? Or something I am simply missing?

Upvotes: 3

Views: 109

Answers (1)

Alex Yarmula
Alex Yarmula

Reputation: 10667

This is a regression in earlier versions of 2.10, before 2.10.1-RC1. I was able to reproduce the issue in 2.10.0, then ran the same code with 2.10.1, and it worked without errors.

Upvotes: 3

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