Interactive#completions: discard absent symbols

Author: smarter

compiler/src/dotty/tools/dotc/interactive/Interactive.scala

@@ -89,7 +89,7 @@ object Interactive {
     val boundaryCtx = ctx.withOwner(boundary)
     try
       prefix.memberDenots(completionsFilter, (name, buf) =>
-        buf ++= prefix.member(name).altsWith(_.symbol.isAccessibleFrom(prefix)(boundaryCtx))
+        buf ++= prefix.member(name).altsWith(d => !d.isAbsent && d.symbol.isAccessibleFrom(prefix)(boundaryCtx))
       ).map(_.symbol).toList
     catch {
       case ex: TypeError => Nil