Spurious unclosed string literal warning in Repl

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Tab completion works fine on a string literal:

Welcome to Scala version 2.10.0-RC2 (Java HotSpot(TM) 64-Bit Server VM, Java 1.6.0_37).
Type in expressions to have them evaluated.
Type :help for more information.

scala> "foo".s
split         startsWith    subSequence   substring     

But if the string contains a comma:

scala> "foo,bar".s<console>:1: error: unclosed string literal
bar"
   ^

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Imported From: https://issues.scala-lang.org/browse/SI-6659?orig=1
Reporter: @paulbutcher
Affected Versions: 2.10.0-RC2
Duplicates #4438

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@som-snytt said:
scala.repl.debug=true shows the completer receives bar" to complete, with the line split on the comma, so when converting that to something it can type, it errors out.

It looks like the parsing is done on the scala side of jline, and maybe this comment is relevant:

def isQuoted = false // TODO

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@retronym said:
Another example from #7762.

 ~/code/scala scala-hash v2.11.0-M4 -nc
[info] v2.11.0-M4 => /Users/jason/usr/scala-v2.11.0-M4-0-g8b41240
Welcome to Scala version 2.11.0-20130710-171554-8b41240f3d (Java HotSpot(TM) 64-Bit Server VM, Java 1.6.0_37).
Type in expressions to have them evaluated.
Type :help for more information.

scala> "99.4".toD<console>:1: error: unclosed string literal
"99
^

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Li Haoyi (lihaoyi) said:
This has been fixed in the Ammonite REPL.

@ "foo".s
sameElements    scan            scanLeft        scanRight       segmentLength   self
seq             size            slice           sliding         sortBy          sortWith
sorted          span            split           splitAt         startsWith      stringPrefix
stripLineEnd    stripMargin     stripPrefix     stripSuffix     subSequence     substring
sum             synchronized
@ "foo,bar".s
sameElements    scan            scanLeft        scanRight       segmentLength   self
seq             size            slice           sliding         sortBy          sortWith
sorted          span            split           splitAt         startsWith      stringPrefix
stripLineEnd    stripMargin     stripPrefix     stripSuffix     subSequence     substring
sum             synchronized
@ "foo,bar".s

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@som-snytt said:
Does Ammonite do column output, column-first instead of row-first? Funny how I can't go back. The other question is whether the JLine dependency is useful.