Groovy closure not capturing static closure variable

问题

Can someone please explain why the call to qux fails? It doesn't seem to capture the name of the static closure variable foo when it is created. If I purposely assign the name to a variable as in baz it works, or if I call it through the class. I thought this variable capture should work for closure class variables too but I must be missing something.

class C {
  static foo = { "foo" }
  static bar = { C.foo() }
  static baz = { def f = foo; f() }
  static qux = { foo() }
}    
println C.foo() //works
println C.bar() //works
println C.baz() //works
println C.qux() //fails

I also tried this as a test and it had no problem capturing the i variable:

class C {
  static i = 3
  static times3 = { "foo: ${it * i}" }
}    
println C.times3(2) //works

[edit] Lastly, if foo is simply a method, it also works as I expected:

class C {
  static foo() { "foo" }
  static bar = { foo() }
}    
println C.bar() //works

回答1:

It seems like this bug. If you treat foo as an attribute, it works:

class C {
  static foo = { "foo" }
  static bar = { C.foo() }
  static baz = { def f = foo; f() }
  static qux = { foo.call() }
}    
assert C.foo() == 'foo'
assert C.bar() == 'foo'
assert C.baz() == 'foo'
assert C.qux() == 'foo'

来源：https://stackoverflow.com/questions/21814923/groovy-closure-not-capturing-static-closure-variable