REPL gets confused about results #9710
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Imported From: https://issues.scala-lang.org/browse/SI-9710?orig=1 |
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Li Haoyi (lihaoyi) said (edited on Mar 17, 2016 4:30:24 PM UTC): haoyi-mbp:blog haoyi$ ~/amm
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Welcome to the Ammonite Repl 0.5.6
(Scala 2.11.7 Java 1.8.0_25)
@ import scala.concurrent.Future
import scala.concurrent.Future
@ import scala.concurrent.ExecutionContext.Implicits.global
import scala.concurrent.ExecutionContext.Implicits.global
@ val f = Future { 4 / 0 }
f: Future[Int] = scala.concurrent.impl.Promise$DefaultPromise@7a17ffee
@ for (exc <- f.failed) println(exc)
java.lang.ArithmeticException: / by zero
@ val f = Future { 4 / 2 }
f: Future[Int] = scala.concurrent.impl.Promise$DefaultPromise@24347d8b
@ val f = Future { 4 / 0 }
f: Future[Int] = scala.concurrent.impl.Promise$DefaultPromise@6d810e94
@ for (exc <- f.failed) println(exc)
java.lang.ArithmeticException: / by zero
@ val f = Future { 4 / 0 }
f: Future[Int] = scala.concurrent.impl.Promise$DefaultPromise@142dbf1a
@ |
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@som-snytt said: |
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Enter the following sequence in the REPL:
import scala.concurrent.Future
import scala.concurrent.ExecutionContext.Implicits.global
val f = Future { 4 / 0 }
for (exc <- f.failed) println(exc)
val f = Future { 4 / 2 }
val f = Future { 4 / 0 }
for (exc <- f.failed) println(exc)
val f = Future { 4 / 0 }
The last line will evaluate as:
scala> val f = Future { 4 / 0 }
f: scala.concurrent.Future[Int] = List()
which is not possible as an empty list is not a Future.
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