# recordGenericSubstitution(_:) The arguments must be encoded order-preserving, and once `decodeGenericSubstitutions` is called, the substitutions must be returned in the same order in which they were recorded. ``` mutating func recordGenericSubstitution(_ type: T.Type) throws ``` ## Parameters `type` a generic substitution type to be recorded for this invocation. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)