[GROOVY-9140] Class.&instanceMethod with incorrect first param

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.0.0-beta-1
• Fix Version/s: 3.0.0-beta-2
• Assignee: Paul King
• Reporter: Paul King
• Created: 23/May/19 11:33
• Updated: 22/Jul/19 04:21
• Resolved: 06/Jul/19 11:00

Description

In Groovy 3 we extended the method pointer to also work for a Class receiver and instance method. When used in this way, the method closure produced accepts an additional initial argument being the instance receiver. This works when supplied with a correct argument but gives an IllegalArgumentException instead of MissingMethodException when an illegal argument is supplied. E.g.:

class Y {
  def m() {1}
}

ref = Y.&m
assert ref(new Y()) == 1
assert ref() == 1 // => java.lang.IllegalArgumentException: object is not an instance of declaring class [Should just be missing method exception?]
assert ref(1) == 1 // => java.lang.IllegalArgumentException: object is not an instance of declaring class [Should just be missing method exception?]