Every executable node gets a hidden error output
The rule
Normative: this is the rule
A reserved error output port is injected on every node type except a non-executable one, carries display order 120, and ships hidden.
Rule identifiers are permanent and are never renumbered. Each implementation publishes its own standing against these rules; this specification does not.spec 1.0-draft · SCH-14 · changed in spec 1.0