Std.Validate.Rule

type

This declaration introduces a public type.

What it does

What a value must be, and what to say when it is not.

A value, so a form's rules can be listed, compared, and reused between the

place a value arrives and the place it is stored — which is the only way

those two stay in agreement. A rule written twice diverges.

Read the signature

• This declaration has no value signature because it introduces a type or trait.