Add "a ?:= 2" support: should be expanded to "a = a ?: 2"

This would allow the very common useful idiom found in Ruby:

variable ||= value

Currently we have to write code like this in Groovy:

def myMap = [:]

if (condition) (myMap[someLongNameObject.getKeyId()] = myMap[someLongNameObject.getKeyId()] ?: []) << someNewValue

Also, if getKeyId() is costly or shouldn't get called more than once for some reason, we would have to write it like:

def myMap = [:]
if (condition) {
  def key = someLongNameObject.getKeyId()
  (myMap[key] = myMap[key] ?: []) << someNewValue
}

When it could be simplified as this:

if (condition) (myMap[someLongNameObject.getKeyId()] ?:= []) << someNewValue

is related to

GROOVY-5306 Add "a ?= 2" support: should be expanded to "a = a == null ? 2 : a"

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Field	Original Value	New Value
Status	Open [ 1 ]	Closed [ 6 ]
Assignee		blackdrag blackdrag [ blackdrag ]
Resolution		Won't Fix [ 2 ]

Resolution	Won't Fix [ 2 ]
Status	Closed [ 6 ]	Reopened [ 4 ]

Link

This issue is related to GROOVY-5306 [ GROOVY-5306 ]

Assignee	blackdrag blackdrag [ blackdrag ]
Fix Version/s		4.0 [ 18928 ]

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