[GROOVY-7580] ExpandoMetaClass append method does not throw an exception as per docs

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.4.7
• Assignee: Unassigned
• Reporter: Aseem Bansal
• Created: 04/Sep/15 20:00
• Updated: 12/Jun/16 08:45
• Resolved: 06/Apr/16 01:30

Description

I was reading the docs when I came across "Note that the left shift operator is used to append a new method. If the method already exists an exception will be thrown."

I decided to try it via the below program. There was no exception. I am using groovy 2.3.8

class A {
}
A.metaClass.hello = {
  "hello superclass"
}

class B extends A {
}
B.metaClass.hello << {
  "hello subclass"
}

B.metaClass.hello << {
  "hello subclass"
}

new B().hello()