I think zig would do to have "custom binary operators" which is not operator overloading, but basically give people what they want. It would suffice to be syntactic sugar elaborated by the parser. For example:

    const @<+> = @import("op.zig").special_add;

    const c = (a <+> b);
    //syntactic sugar for @<+>(a, b)

Maybe it will add that. But just how important that is, though, I'm not so sure. Languages like Java, C, and Go don't currently offer custom infix operators, and they are more popular than many languages that do.

Note that there are some complexities, though, to infix operators regarding the order of operations (e.g. + vs * in ordinary mathematical notation) and associativity (e.g. is `(x <+> y) <+> z` equal to `x <+> (y <+> z)`?). They can be dealt with, of course, but not without adding complexity that may or may not be worth it.