[GROOVY-9168] Default Arguments: non-static inner class constructor call in default value not supported

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.0.0-beta-1, 2.5.7
• Fix Version/s: 3.0.0-beta-3, 2.5.13
• Assignee: Daniel Sun
• Reporter: Eric Milles
• Created: 09/Jun/19 18:42
• Updated: 09/Jun/20 10:01
• Resolved: 13/Jul/19 18:21

Description

This is a variation of GROOVY-6777, GROOVY-6809 and GROOVY-7609.  A constructor's parameter may not presently be defaulted by a value expression using a non-static inner class (including anon. inner). This is likely caused by the uninitialized "this" reference that is supplied to the constructor of the non-static inner class.

// Error: Apparent variable 'this' was found in a static scope but doesn't refer to a local variable, static field or class.
class Outer {
  class Inner {} // make this static and all is well
  Outer(Inner inner = new Inner()) {
  }
}
new Outer()

class C {
  C(Runnable runner = new Runnable() { void run() {} }) {
    //                ^^^^^^^^^^^^^^ enclosing method not set and ...
    this.runner = runner
  }
  Runnable runner
}
new C().runner.run()

Issue Links

• links to: GitHub Pull Request #963