'this' as default parameter value in a function refers to the wrong object #991

Here's a short example:

A: class {
 value := 0
 other: Int
 init: func
 foo: func (v := this value) {
 this other = v
 }
}
B: class {
 whatever := 1
 init: func
 bar: func (w := this whatever) -> Int {
 a := A new()
 a foo()
 a other
 }
}
b := B new()
something := b bar(2)

The value of v in foo should be this value but this does not point to itself but rather to the calling object b and fails with: error: ‘example__B’ has no member named 'value'

The same happens if the last line is replaced with something := b bar(), then the default value of w in bar fails because this is undeclared (we're not calling from any object).

(I assume this is not by design.)