On Tue, Dec 22, 2020 at 10:15 PM Andre Pany via Digitalmars-d-learn <digitalmars-d-learn@puremagic.com> wrote:
Hi,

I am really confused, why is this valid:
void sample(string[string] s = string[string].init){}

while this causes syntax errors?

void sample_invalid1(double[string] s = double[string].init){}
void sample_invalid2(int[int] s = int[int].init){}

Kind regards
André

As has been said this is an oddity in the grammar. But why would anyone need to use this anyway? 

  void sample_invalid2(int[int] s = int[int].init){}

seems really awful to me anyway.