Imported From: https://issues.scala-lang.org/browse/SI-1655?orig=1
Reporter: @SethTisue
Attachments:

• lazyrepl.patch (created on Feb 3, 2009 8:04:50 PM UTC, 2822 bytes)

Geoffrey Alan Washburn (washburn) said:
After some quick investigation this looks like it might be feasible. However, I won't have time to work on this myself, so I am going to assign it to scala_community. Whenever the REPL gets a new owner, they can consider whether to tackle this enhancement.

@paulp said:
I have implemented this, patch attached.

scala> lazy val x1 = { println("I'm a lazy x1") ; 5 }
lazy val x1: Int = <deferred>

scala> lazy val x2 = { println("I'm a lazy x2") ; 55.3 }
lazy val x2: Double = <deferred>

scala> x2 + x1
I'm a lazy x2
I'm a lazy x1
res0: Double = 60.3

scala> x2 + x1 + 5
res1: Double = 65.3

I thought I'd be able to just dash it off but it was harder than I thought -- though the final patch only adds a net of five lines to the interpreter, I'm sure I had 100-150 lines going at the peak. At least I learned a lot about the repl along the way. Please let me know if this is inadequate and I'll do whatever else is needed.

@paulp said:
Implemented in r17050.