writeOpcode

        pub fn writeOpcode(writer: *Writer, comptime opcode: u8) !void {
            if (options.call_frame_context and !comptime isOpcodeValidInCFA(opcode)) return error.InvalidCFAOpcode;
            switch (opcode) {
                OP.dup,
                OP.drop,
                OP.over,
                OP.swap,
                OP.rot,
                OP.deref,
                OP.xderef,
                OP.push_object_address,
                OP.form_tls_address,
                OP.call_frame_cfa,
                OP.abs,
                OP.@"and",
                OP.div,
                OP.minus,
                OP.mod,
                OP.mul,
                OP.neg,
                OP.not,
                OP.@"or",
                OP.plus,
                OP.shl,
                OP.shr,
                OP.shra,
                OP.xor,
                OP.le,
                OP.ge,
                OP.eq,
                OP.lt,
                OP.gt,
                OP.ne,
                OP.nop,
                OP.stack_value,
                => try writer.writeByte(opcode),
                else => @compileError("This opcode requires operands, use `write<Opcode>()` instead"),
            }
        }