Cannot use protocol with primary associated type requirement in protocol composition #75602
Closed as duplicate of#63877
Description
The following doesn’t compile. I would expect it to. Otherwise I don’t see any way of specifying any kind of String collection that’s sendable.
let x: any Collection<String> & Sendable = [] // error: Non-protocol, non-class type 'Collection<String>' cannot be used within a protocol-constrained typerdar://132374933
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A deviation from expected or documented behavior. Also: expected but undesirable behavior.The Swift compiler itselfFeature: values of types like `any Collection`, `Any` and `AnyObject`; type-erased valuesFeature → protocol: protocols with primary associated typesFeature → types: protocol composition typesArea → compiler: Semantic analysisFeature: typesBug: Unexpected error