error: <function const> depends on itself

[kristate]

Could be related to #624 and/or #679

zig version
0.2.0+55193cb1

Test case:

const my_callback_h = fn (*MyStruct) error!void;

const MyStruct = struct {
  callback: my_callback_h,

  fn init(cb: my_callback_h) MyStruct {
    return MyStruct {
      .callback = cb,
    };
  }
};

fn main_callback(ms: *MyStruct) error!void {
  return;
}

pub fn main() void {
  var a = MyStruct.init(main_callback);
}

Returns

main.zig:1:1: error: 'my_callback_h' depends on itself
const my_callback_h = fn (*MyStruct) error!void;
^

[andrewrk]

Here's a workaround in the meantime:

const my_callback_h = fn (*MyStruct) error!void;

const MyStruct = struct {
    callback: fn (*MyStruct) error!void,

    fn init(cb: fn (*MyStruct) error!void) MyStruct {
        return MyStruct{ .callback = cb };
    }
};

fn main_callback(ms: *MyStruct) error!void {
    return;
}

pub fn main() void {
    var a = MyStruct.init(main_callback);
}

[andrewrk]

I'm pretty sure this is a duplicate of #624 and not #679. I'll leave it open until this test case is covered.

[andrewrk]

fixed by #2174