Normandy.Guardrails.Builtins.RequiredFields
(normandy v0.6.0)
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Rejects a struct or map when any of the named fields are nil.
Intended for output guardrails: Normandy's ValidationMiddleware already
enforces schema-level required constraints, but this guard lets callers
assert on fields whose "must be populated" requirement is runtime (for
example, a response schema where result is optional in the spec but must be
present in this particular workflow).
Options
:fields(required) — non-empty list of atoms.
Emits one violation per missing field, each with :path set to [field]
so existing error renderers show the field name.