Invalid REPL completions on null.

[lrytz]

scala> null.
takeWhile(                          sameElements(                       lastIndexWhere(                     toSeq
unapply(                            maxOption(                          intersect(                          stripLineEnd
toByte                              union(               (deprecated)   apply(                              equals(               (universal)
andThen(                            orElse(                             isEmpty                             exists(
patch(                              findLast(                           length()                            copyToBuffer(        (deprecated)
...

[SethTisue]

(note that this happens even in 2.12.11 and 2.13.1, before the JLine 3 upgrade. but yeah, good to tackle while we're working on tab completion anyway)

[jxnu-liguobin]

scala> null.

It seems that null (Constant) gets incorrect applicableViews during implicit search. What do we expect is to treat null as an Object ? (Perhaps not the most accurate, but it's the smallest set of accurate results.)

[som-snytt]

Dotty:

scala> null.
!=             ==             eq             getClass       isInstanceOf   notify         synchronized   wait
##             asInstanceOf   equals         hashCode       ne             notifyAll      toString

Spec is at https://scala-lang.org/files/archive/spec/2.13/06-expressions.html#the-null-value

Here is a difference; I was curious whether "maximal subexpression" implies throwing on "a reference to any other member".

scala> null.synchronized
val res0: Any => Any = Lambda$1305/0x0000000801098410@5408d4b3

scala 2.13.6> null.synchronized _
val res0: Nothing => Nothing = $Lambda$1077/0x0000000801008e78@1220ef43

[jxnu-liguobin]

otty:

scala> null.
!=             ==             eq             getClass       isInstanceOf   notify         synchronized   wait
##             asInstanceOf   equals         hashCode       ne             notifyAll      toString

This looks the same as the candidate for object. “A reference to any other member of the "null" object”