Constant ZX_ERR_NEXT 

pub const ZX_ERR_NEXT: i32 = -61;

Advance to the next item.

The flow control values ZX_ERR_STOP, ZX_ERR_NEXT, and ZX_ERR_ASYNC are not errors and will never be returned by a system call or public API. They allow callbacks to request their caller perform some other operation.

For example, a callback could use this value to indicate it did not consume an item passed to it, but by choice, not due to an error condition.