Bitflag Class - Function error

[nonunknown]

I'm using the Bitflag class, the following function (when you place the Bitflag.gd into project folder) pushes the following error:

Workaround
the only workaround I've found was commenting the mentioned function, but the class itself still works

Godot info
Using Godot 3.2.3 RC2

[willnationsdev]

I'll have to look into this when I get a chance.