REPL + -Ywarn-unused-import (or, since 2.12.2 -Xlint) = spurious "Unused import" warnings

[scabug]

Welcome to Scala version 2.11.0-M4 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0-ea).

scala> import java.util.ArrayList
<console>:7: warning: Unused import
       import java.util.ArrayList
                        ^

oh you silly REPL!

[scabug]

Imported From: https://issues.scala-lang.org/browse/SI-7722?orig=1
Reporter: @SethTisue
Affected Versions: 2.11.0-M4

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@paulp said:
Yeah, the repl isn't real usable with -Xlint, unfortunately.

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@SethTisue said:
I wouldn't normally intentionally fire up a REPL with -Xlint, fearing exactly this sort of thing, but I have -Xlint in my scalacOptions in my sbt project, and so that ends up applying to the REPL too when I run console.

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@paulp said:
Yes, I have the same problem. I floundered around with "scalacOptions in console" type adjustments without managing to subtract it for the console individually. I imagine it's possible though.

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@SethTisue said (edited on Aug 7, 2013 3:52:47 AM UTC):
after only a brief moment of thought, and without any Googling at all, and certainly not any consulting of any of Jason Zaugg's answers on Stack Overflow, I dashed this off and it worked on the first try:
set scalacOptions in (Compile, console) ~= (_.filterNot(_ == "-Xlint"))

signed, A. Liar

[SethTisue]

the severity here has increased now that since 2.12.2 -Ywarn-unused-import is part of -Xlint

[SethTisue]

LOL

% scala -Xlint
...
scala> :power
<console>:12: warning: Unused import
       import $r._
                                      ^
<console>:15: warning: Unused import
       import scala.tools.nsc._, scala.collection.JavaConverters._, intp.global.{ error => _, _ }, definitions.{ getClass => _, _ }, power.rutil._, replImplicits._, treedsl.CODE._
                              ^
<console>:15: warning: Unused import
       import scala.tools.nsc._, scala.collection.JavaConverters._, intp.global.{ error => _, _ }, definitions.{ getClass => _, _ }, power.rutil._, replImplicits._, treedsl.CODE._
                                                                 ^
<console>:15: warning: Unused import
       import scala.tools.nsc._, scala.collection.JavaConverters._, intp.global.{ error => _, _ }, definitions.{ getClass => _, _ }, power.rutil._, replImplicits._, treedsl.CODE._
                                                                                                                                ^
<console>:15: warning: Unused import
       import scala.tools.nsc._, scala.collection.JavaConverters._, intp.global.{ error => _, _ }, definitions.{ getClass => _, _ }, power.rutil._, replImplicits._, treedsl.CODE._
                                                                                                                                                 ^
<console>:15: warning: Unused import
       import scala.tools.nsc._, scala.collection.JavaConverters._, intp.global.{ error => _, _ }, definitions.{ getClass => _, _ }, power.rutil._, replImplicits._, treedsl.CODE._
                                                                                                                                                                  ^
<console>:15: warning: Unused import
       import scala.tools.nsc._, scala.collection.JavaConverters._, intp.global.{ error => _, _ }, definitions.{ getClass => _, _ }, power.rutil._, replImplicits._, treedsl.CODE._
                                                                                                                                                                                  ^```

[gmalouf]

This also causes a large number of errors on play 2.6.7 (at least) - so I would be thrilled to see it fixed.