REPL does not compile for ident name 1

[scabug]

Welcome to Scala version 2.11.7 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_45).
Type in expressions to have them evaluated.
Type :help for more information.

scala> val `1` = "foo"
<console>:5: error: ';' expected but double literal found.
  lazy val $result = 1
                                         ^
<console>:10: error: ')' expected but double literal found.
 + "1: String = " + scala.runtime.ScalaRunTime.replStringOf(1, 1000)
                                                                                ^
<console>:13: error: ')' expected but '}' found.
  }
  ^

[scabug]

Imported From: https://issues.scala-lang.org/browse/SI-9467?orig=1
Reporter: @Atry
Affected Versions: 2.11.7
Duplicates #8456

[scabug]

@som-snytt said:
Since I just looked up the issues, I'll also paste the joke:

Backticks are the worst bugs because they carry Lyme disease.

#6919

#7957

Actually, the duplicate is #8456

The double literal is due to the selection $iw.1.

Here is a related, possibly unexpected result:

$ scala
Welcome to Scala 2.11.8 (Java HotSpot(TM) 64-Bit Server VM 1.8.0_60)
Type in expressions for evaluation. Or try :help.

scala> .1
<console>:1: error: ';' expected but double literal found.
$intp.1
     ^