Tab completion in the REPL doesn't work in certain cases

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=== What steps will reproduce the problem (please be specific and use wikiformatting)? ===

For example:

   scala> List( 1, 2, 3 ).redu<tab>

=== What is the expected behavior? ===

I should see the following options:

   reduceLeft          reduceLeftOption    reduceRight         reduceRightOption

=== What do you see instead? ===

   <console>:1: error: illegal start of definition

=== What versions of the following are you using? ===

• Scala: 2.8.1 and 2.9.0.RC1
• Java: 1.6.0_20
• Operating system: 10.6.4

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Imported From: https://issues.scala-lang.org/browse/SI-4438?orig=1
Reporter: @Sciss

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@soc said:
On 2.10.0.r24908-b20110508020204 too. Actually this one exists for a long time already.

Array(1,2,3) has the same problem.

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Li Haoyi (lihaoyi) said:
This is fixed in the Ammonite REPL

@ List( 1, 2, 3 ).reduce<TAB>
reduce              reduceLeft          reduceLeftOption    reduceOption        reduceRight
reduceRightOption
@ List( 1, 2, 3 ).reduce

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@som-snytt said (edited by @lrytz on Sep 20, 2015 7:26:38 AM UTC):
github.com/scala/scala/pull/4659 part of scala/scala#4725