In their versions without parameters, these two operators would
be called in the same way. If both are defined, opIndex() is
called, regardless of lexical definition order, according to my
test with DMD.
If both (again I'm just talking about the overloads with no
arguments) are defined within the same type, it's the fault of
the author. But I would think the compiler should complain.
They can also be inherited, which is sneakier.
The web reference tersely says under its *Slice* Operator
Overloading chapter [1]:
"To overload a[], simply define opIndex with no parameters."
Should not the overload of opSlice() with no arguments be
deprecated? Am I missing something?
[1] https://dlang.org/spec/operatoroverloading.html#array-ops
