Methods containing bang doesn't work in REPL

Question

I am running Scala 2.9.2 REPL and if I copy&paste following method:

  def isPrime(num: Int): Boolean = {
    val ceiling = math.sqrt(num.toDouble).toInt
    (2 to ceiling) forall (x => num % x != 0)
  }

..from the file with a source code (where it works well) to the Interactive Interpreter. I get this exception:

java.lang.IllegalArgumentException: != 0): event not found
   at jline.console.ConsoleReader.expandEvents(ConsoleReader.java:426) 
   ...

The problem is the ! character (methods without exclamation mark works well).

Is there any way to make the method work in the REPL?

This works well for me in Scala 2.9.2 and 2.10.1 on Ubuntu. What system are you running it on? — ghik, Jul 13 '13 at 13:14
strange, Fedora 17 (32 bit PAE), Oracle Java 7 (but it is the same on OpenJDK and Oracle Java 6) — Jiri Kremser, Jul 13 '13 at 13:23
Perhaps jLine is reading a config file (some `.*rc` file) that enables a shell-like history function? — Randall Schulz, Jul 13 '13 at 13:33
Looks like a bug https://issues.scala-lang.org/browse/SI-6143 (unfortunately (for me) they closed it as NOT A BUG) :/ — Jiri Kremser, Jul 13 '13 at 13:44
Deleted my incorrect answer--you should add your own answer with how you got around the problem. — Rex Kerr, Jul 13 '13 at 18:34

score 1 · Answer 1 · answered Jul 13 '13 at 18:41

1

I wasn't able to overcome this issue with the original installation, but installing new version of Scala helped. Perhaps, it is issue of Fedora 17 rpm Scala package.

answered Jul 13 '13 at 18:41

Jiri Kremser

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som-snytt · Accepted Answer · 2013-07-14T06:01:14.357

1

You might have missed this instance:

https://issues.scala-lang.org/browse/SI-7650

But the paulp fix isn't backward compatible.

scala> :power
** Power User mode enabled - BEEP WHIR GYVE **
** :phase has been set to 'typer'.          **
** scala.tools.nsc._ has been imported      **
** global._, definitions._ also imported    **
** Try  :help, :vals, power.<tab>           **

scala> $r.r.in.asInstanceOf[scala.tools.nsc.interpreter.JLineReader].consoleReader.setExpandEvents(false)

scala> 1 != 2
res1: Boolean = true

as opposed to crashing on 2.11:

scala> 1 != 2
java.lang.IllegalArgumentException: != 2: event not found

edited Jul 14 '13 at 06:01

answered Jul 14 '13 at 02:45

som-snytt

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Unfortunately doesn't work for Scala 2.9.2 (`setExpandEvents()` method is missing on `JLineConsoleReader` class in that version) Also I had to replace `$r.r.in...` with `$r.repl.in...` to make it work. I accept this answer, because it solves the issue for newer versions of Scala, where the API is in place. – Jiri Kremser Jul 14 '13 at 16:22

Methods containing bang doesn't work in REPL

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