Cannot using sending with some return value

[mattmassicotte]

Description

Hmm, shouldn't this be allowed? It is a result!

test.swift:7:21: error: 'sending' may only be used on parameters and results
 5 | }
 6 | 
 7 | func makeThing() -> sending some MyProtocol {
   |                     `- error: 'sending' may only be used on parameters and results
 8 |     NonSendable()
 9 | }

Reproduction

protocol MyProtocol {
}

class NonSendable: MyProtocol {
}

func makeThing() -> sending some MyProtocol {
    NonSendable()
}

Expected behavior

No errors

Environment

Apple Swift version 6.0-dev (LLVM 5b37bd4c1c578e9, Swift 54898ce)
Target: arm64-apple-macosx14.0

Additional information

No response