Incorrect position on first definition in multiple variable declaration

[kasiaMarek]

Reproduction steps

In the following code:

object O {
  val xx, yy, zz = 1
}

ValDef tree for x has incorrect position, the position is an offset instead of range.

Value definition positions:

• xx - line-2,offset=17 //offset
• yy - (21, 21, 31) //range
• zz - (25, 25, 31) //range

Scala version: 2.13.15

Problem

I would expect the val def tree for xx to have a range position (17, 17, 31).

[som-snytt]

I'll take a look, as I'm sure this syntax came up during previous postdoc research into positions.

Relevant
scala/scala#9355
and unmerged
scala/scala#9111
and
scala/scala#10740 (comment)
may be my most recent memory of the issue.

[som-snytt]

@lrytz new API got some exercise making pattern defs

       val defPos = {
-        if (lhsPos.isRange) lhsPos.withStart(start).withEnd(in.lastOffset)
+        if (lhsPos.isRange) lhsPos.copyRange(start = start, end = in.lastOffset)
         else o2p(start)
       }