Wrong position for inlined pure arguments

[nicolasstucki]

class Foo {
  inline def fun(x: String): String = x
  def foo = fun("abc")
}

sbt:dotty> dotc Foo.scala -Xprint:front -Yprint-pos -Ydebug-pos
[warn] Multiple main classes detected.  Run 'show discoveredMainClasses' to see the list
[info] Running (fork) dotty.tools.dotc.Main -classpath /Users/nicolasstucki/.ivy2/cache/org.scala-lang/scala-library/jars/scala-library-2.12.8.jar:/Users/nicolasstucki/GitHub/dotty/library/../out/bootstrap/dotty-library-bootstrapped/scala-0.14/dotty-library_0.14-0.14.0-bin-SNAPSHOT.jar Foo.scala -Xprint:front -Yprint-pos -Ydebug-pos
result of Foo.scala after frontend:
package <empty>@Foo.scala<0..0> {
  class Foo() extends Object@Foo.scala<6..6>@
    Foo.scala<6..6>
  ()@Foo.scala<6..6> { 
    inline def fun(
      x: String@Foo.scala<32..38>@
        Foo.scala[29..38]
    ): String@Foo.scala<41..47> = 
      x@Foo.scala<50..51> :
        String@Foo.scala<41..47>
      @Foo.scala<41..51>
    @Foo.scala[14..25..51]
    def foo: String = 
      /* inlined from 
        this@Foo.scala<64..64>.fun@
          Foo.scala<64..67>
        ("abc"@Foo.scala<68..73>)@
          Foo.scala<64..74>
       */ 
        {
          "abc"@Foo.scala<50..51> :
            String@Foo.scala<41..47>
          @Foo.scala<64..74>
        }
      @Foo.scala<64..74>
    @Foo.scala[54..58..74]
  }@Foo.scala[0..6..76]
}@Foo.scala<0..76>

We can see that the position before inlining was "abc"@Foo.scala<68..73> but after inlining it becomes "abc"@Foo.scala<50..51> which is the position of the x in the body of fun.

#6024 will add a way to test these positions.